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QozrNrBoPAoqSitaTQGu

Study note

michaela

United States of America

DEFAULT (US)

DEFAULT

Biology

field patterns

Forces at a distance

Electric forces

Electrical Conductors
↳ Melals Contain free electrons
L not attached to
any
atom
221 Field Patterns
Electrically Insulating materials
↳ dont contain free electrons
& all electrons attached to individual atoms
Field lines Patterns
path a free positive test charge follows
La Line of force or field line
↳ direction of field line is direction a small positive test charge would take
+
+
Uniform Electric field pattern
4 field lines parallel so uniform
& Positive test charge repels from
tve plate & attracts to - ve
plate
· Object is charged when electrons are added & removed
Charge Can be +Ve
or - ve
Force can be both attractive + repulsive
to differs from gravitational force which is always
attractive
Test charge needs to be negligible so not to intefere with electric
field Density of field lines
4 illustrate Strength of field
↳ Closer the lines the stronger the field.
Field patterns
to Two point charges create fields Similiar to magnets
La Radial
Distant point charges Create Linear & uniform lines rather than radial
Positive + negative.
Point forces
+
?
·.>
7
M
Positive Point object.
$ grounded plate.
• Two negative point objects
22.2 Electric field Strength
Electric field Strength (E)
↳ force
unit charge on a positive test charge
per
at point in a field
↳ Newton per coloumb (NC-¹)
↳ Same direction as force on positive test charge. Test charge
4. Charge
G
F force (N)
Q→ Charge (c)
E electric field Strength (E).
+ +
d
V
E = E
4E = V
d
off
+. Size is small
Electric field Strength Calculated from Pd, V, between
plates + Seperation, d.
(2)
ⒸE = € ⒸE = V
==
वै
·Parallel oppositely charged
plates
& Field lines are
VQ = Fd
W Q = Fd.
↳ Parallel
• Perpindicular to plate
↳ Direct d +ve to -ve plate
Uniform field.
Work done on test charge. If moved between two
plates is W = FD
V.=
d
W=Fd
40. Permativity
of free Space
·Electrical charges try to distribute themselves
equally over Surface of metal conductor
4 Irregular shaped object can lead to greater
Concentrations of charge at positions
L
Greater concentrations increases Electrical field
Strength
↳o represented by greater density of field lines
L
Concentration of Charge
Charge per unit area =
↳ proportional to E
La
E L
E
11
V.
ole of da
E = E
&
k = Eo
4 permuittivity of free space
*10-12 fm-'
498.85 ought
22.3 Electric potential
Electric Potential (v)
↳ Work clone
unit
per
charge.
to move a positive
test charge from infinity to a position in an
electric field
V=₂W
units: jc- ·Amount of energy needed to remove a charged partick
from it's position in a field to infinitly. far away
Equipotentials → line or Surface in field along which
electric potential is constant
↳ Surfaces of constant potential
↳ field lines cross equipotentials
at
right angles to surface
Work done to move charged particle from one equipotential
to another is equal to difference in electric potential
multiplied by charge
↳ W = Q (V₂ - V₁ )
Potential Gradient
៤
49 Change of potential per unit change of distance,
at a point in a field, along a field line at that point
↳ Closer equipotentials are greater potential gradien."
↳ Equal to electric field Strength
22.4 Coloumb's law
Q₁. * Q₂.
IS proportional to the amount of each charge
& to the inverse of the Square of the distance
between two charges
Coloumbs law Force. F. between two point charges.
→>>>
F= __ I
4T Eo
Q. Q₂
pa
rdistance between
charges Distance, r, from point charge Q.
22.5 Point Charges.
Electric field Strength .E=UT
4॥ ०
Electric potential.
Graphs
distance.r
44
Electric Potential distance graph
• Electric field Strength
↳ negative of gradient
·F
Electric field Strength - clistance
↳ area under graph = Change in potential
Negative
V = 1
attractive
4 π Eo
F
+ positive force on positive test charge.
360
Repulsive.
(+ F 2 positive forces on a positive point charge
Repulsive
F+
F₁-F₂.
Forces C an angle on positive point charge.
Repulsive
Repulsive
13
F= √(F₁)² + (F₂) ²
F
Repulsive

field patterns

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field patterns

Can't find what you're looking for? Explore other subjects.

Knowunity is the # 1 ranked education app in five European countries

Knowunity was a featured story by Apple and has consistently topped the app store charts within the education category in Germany, Italy, Poland, Switzerland and United Kingdom. Join Knowunity today and help millions of students around the world.

4.9+

13 M

#1

950 K+

Still not sure? Look at what your fellow peers are saying...

I love this app so much [...] I recommend Knowunity to everyone!!! I went from a C to an A with it :D

The application is very simple and well designed. So far I have found what I was looking for :D

Love this App ❤️, I use it basically all the time whenever I'm studying