Electrostats Flashcards
(40 cards)
1
Q
Properties of charges
A
quantised, additive, conserved
2
Q
Coulombs Law
A
Kq1q2/r^2
3
Q
relative permittivity
A
F/Fm = Em
4
Q
Absolute permittivity
A
E = EoEm
5
Q
Electric field
A
space around a charge where it experiences FOA/FOR
6
Q
F=qE
A
7
Q
E= kq
—-
r^2
A
+ to -
8
Q
Electric Field Lines
A
9
Q
Dipole
A
10
Q
Dipole moment
A
- to +
11
Q
EF due to dipole on axial position
A
2Kp/r^3
12
Q
EF due to dipole at equitorial
A
-Kp/r^3
13
Q
Torque on a dipole kept in a uniform EF
A
pEsin0
14
Q
Flux
A
EAcos0
15
Q
derivation of gauss law statement
A
16
Q
EF due to an inf long wire
A
17
Q
EF due to inf thin sheet
A
18
Q
Ef due to uniformly charged thin shell
A
19
Q
W/q0 = V
A
20
Q
V due to a point charge
A
21
Q
PE due to 2 charges
A
22
Q
PE due to 3 charges
A
23
Q
V due to a dipole
a) axial
b) equitorial
A
V = Kpcos0/r^2
a) Kp/r^2
b) 0
24
Q
PE stored in a dipole kept in unif EF
a) stable
b) unstable
A
25
Dielectrics
does not allow flow of charge but lets them exert elec force
26
Equipotential surface
27
r/s b/w E and V
28
Capacitance of spherical conductor
29
Principle of capacitor
large C, small V
30
Capac of parallel plate capac, V, E
also dielectric medium
31
Electrostatic shielding
cavity of conductor remains shielded from outside electric influence
32
Capac in series
33
Capac in parallel
34
PE in capacitor
35
Battery Connected
C, q, U inc
V,E same
36
Battery disconnected
C inc
q same
E,V,U dec
37
Energy density of capac
38
Capac w dielectric of thickness t
39
factors affecting capacitor
size n shape
nature of surrounding
presence of other conductors
40
Common potential
C1V1+C2V2 = (C1+ C2) V
