Magnetism is a fascinating force that powers everything from compass... Show more
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
0
0
haley
11/17/2025
Physics
Physics: Magnetic Fields
1 / 3
Magnetic Basics and Field Properties
Magnets always have two poles: a North pole and a South pole. These poles follow a simple rule of interaction - opposite poles attract each other (like N and S), while like poles repel each other (N and N, or S and S).
Magnetic fields have several important properties that define how they work. They can be created by moving charges and always travel from North to South poles. These fields form continuous, closed loops that naturally follow the path of least resistance. The concentration of field lines indicates magnetic field strength - more lines means a stronger field!
Think About It: Magnetic fields are invisible but powerful forces. Even though you can't see them, they're constantly at work in devices all around you, from your phone to your headphones!
When drawing magnetic fields, we represent them as lines showing the path a North pole would follow. For a single bar magnet, field lines emerge from the North pole and curve around to enter the South pole. When two like poles are placed near each other, the field lines push away from each other, visually representing the repulsion force.
Magnetic Forces on Moving Charges
When two opposing poles (North and South) are placed near each other, their magnetic field lines connect directly between them, showing the attractive force pulling them together.
A moving charged particle experiences a force when it travels through a magnetic field. This force is calculated using the equation: F = qvB, where F is the force (in Newtons), q is the particle's charge, v is its velocity (in meters per second), and B is the magnetic field strength (in Teslas).
For example, a particle with 0.075 C charge moving at 0.99 m/s through a 2 Tesla magnetic field experiences a force of 0.1485 N. We calculate this by simply multiplying all three values together: F = 0.075 C × 0.99 m/s × 2 T = 0.1485 N.
Pro Tip: The direction of this force can be determined using the "Right Hand Rule" - a technique that helps visualize the 3D relationships between charge movement, magnetic fields, and the resulting force.
Electron Movement in Magnetic Fields
When an electron (with charge 1.6×10⁻¹⁹ C) travels through a stronger magnetic field, the force is much smaller but still follows the same principle. For an electron moving at 2,000 km/s through a 15 Tesla field, we calculate F = (1.6×10⁻¹⁹ C) × × 15 T = -4.8×10⁻¹² N.
The negative sign indicates the direction of the force (electrons have negative charge). Although this force seems tiny, it has significant effects at the atomic scale!
We can determine the acceleration of the electron by using Newton's Second Law . Since we know the force and the mass of an electron (9.11×10⁻³¹ kg), we calculate: a = F/m = (-4.8×10⁻¹²)/9.11×10⁻³¹ = -5.26×10¹⁸ m/s². This enormous acceleration explains why electrons move in curved paths in magnetic fields.
Amazing Fact: The acceleration an electron experiences in a strong magnetic field can be trillions of times stronger than Earth's gravity! This is how particle accelerators and TV screens control electron movement.
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.9/5
App Store
4.8/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Understanding Magnetic Fields in Physics
Magnetism is a fascinating force that powers everything from compass navigation to powerful electromagnets. In this summary, we'll explore the fundamental properties of magnets, magnetic fields, and how they interact with charged particles.
Magnetic Basics and Field Properties
Magnets always have two poles: a North pole and a South pole. These poles follow a simple rule of interaction - opposite poles attract each other (like N and S), while like poles repel each other (N and N, or S and S).
Magnetic fields have several important properties that define how they work. They can be created by moving charges and always travel from North to South poles. These fields form continuous, closed loops that naturally follow the path of least resistance. The concentration of field lines indicates magnetic field strength - more lines means a stronger field!
Think About It: Magnetic fields are invisible but powerful forces. Even though you can't see them, they're constantly at work in devices all around you, from your phone to your headphones!
When drawing magnetic fields, we represent them as lines showing the path a North pole would follow. For a single bar magnet, field lines emerge from the North pole and curve around to enter the South pole. When two like poles are placed near each other, the field lines push away from each other, visually representing the repulsion force.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Magnetic Forces on Moving Charges
When two opposing poles (North and South) are placed near each other, their magnetic field lines connect directly between them, showing the attractive force pulling them together.
A moving charged particle experiences a force when it travels through a magnetic field. This force is calculated using the equation: F = qvB, where F is the force (in Newtons), q is the particle's charge, v is its velocity (in meters per second), and B is the magnetic field strength (in Teslas).
For example, a particle with 0.075 C charge moving at 0.99 m/s through a 2 Tesla magnetic field experiences a force of 0.1485 N. We calculate this by simply multiplying all three values together: F = 0.075 C × 0.99 m/s × 2 T = 0.1485 N.
Pro Tip: The direction of this force can be determined using the "Right Hand Rule" - a technique that helps visualize the 3D relationships between charge movement, magnetic fields, and the resulting force.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Electron Movement in Magnetic Fields
When an electron (with charge 1.6×10⁻¹⁹ C) travels through a stronger magnetic field, the force is much smaller but still follows the same principle. For an electron moving at 2,000 km/s through a 15 Tesla field, we calculate F = (1.6×10⁻¹⁹ C) × × 15 T = -4.8×10⁻¹² N.
The negative sign indicates the direction of the force (electrons have negative charge). Although this force seems tiny, it has significant effects at the atomic scale!
We can determine the acceleration of the electron by using Newton's Second Law . Since we know the force and the mass of an electron (9.11×10⁻³¹ kg), we calculate: a = F/m = (-4.8×10⁻¹²)/9.11×10⁻³¹ = -5.26×10¹⁸ m/s². This enormous acceleration explains why electrons move in curved paths in magnetic fields.
Amazing Fact: The acceleration an electron experiences in a strong magnetic field can be trillions of times stronger than Earth's gravity! This is how particle accelerators and TV screens control electron movement.
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
0
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Mock Exam
Quiz
Flashcards
Essay
Similar Content
Understanding Electric Fields
Explore the fundamentals of electric fields, including electric potential, field strength, and Coulomb's law. This summary covers key concepts such as electric potential energy, electrostatic forces, and the rules for drawing electric field lines. Ideal for students studying electricity and magnetism.
Physics12
Static Charge & Electric Fields
Explore the principles of static electricity, including charge transfer, spark formation, and the characteristics of electric fields. This summary covers the behavior of charged materials, the concept of potential difference, and how to represent electric fields visually. Ideal for students studying physics concepts related to electricity.
Physics10
Electric Current
Notes describing electric currents and their properties
PhysicsEKG and Monitoring Devices
Study guide EKG 2,9
PhysicsCan't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.9/5
App Store
4.8/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user