Electrostats

Question 1

Properties of charges

Answer 1

quantised, additive, conserved

Question 2

Coulombs Law

Answer 2

Kq1q2/r^2

Question 3

relative permittivity

Answer 3

F/Fm = Em

Question 4

Absolute permittivity

Answer 4

E = EoEm

Question 5

Electric field

Answer 5

space around a charge where it experiences FOA/FOR

Question 6

F=qE

Question 7

E= kq
—-
r^2

Answer 7

+ to -

Question 8

Electric Field Lines

Question 9

Dipole

Question 10

Dipole moment

Answer 10

• to +

Question 11

EF due to dipole on axial position

Answer 11

2Kp/r^3

Question 12

EF due to dipole at equitorial

Answer 12

-Kp/r^3

Question 13

Torque on a dipole kept in a uniform EF

Answer 13

pEsin0

Question 14

Flux

Answer 14

EAcos0

Question 15

derivation of gauss law statement

Question 16

EF due to an inf long wire

Question 17

EF due to inf thin sheet

Question 18

Ef due to uniformly charged thin shell

Question 19

W/q0 = V

Question 20

V due to a point charge

Question 21

PE due to 2 charges

Question 22

PE due to 3 charges

Question 23

V due to a dipole
a) axial
b) equitorial

Answer 23

V = Kpcos0/r^2
a) Kp/r^2
b) 0

Question 24

PE stored in a dipole kept in unif EF
a) stable
b) unstable

Question 25

Dielectrics

Answer 25

does not allow flow of charge but lets them exert elec force

Question 26

Equipotential surface

Question 27

r/s b/w E and V

Question 28

Capacitance of spherical conductor

Question 29

Principle of capacitor

Answer 29

large C, small V

Question 30

Capac of parallel plate capac, V, E
also dielectric medium

Question 31

Electrostatic shielding

Answer 31

cavity of conductor remains shielded from outside electric influence

Question 32

Capac in series

Question 33

Capac in parallel

Question 34

PE in capacitor

Question 35

Battery Connected

Answer 35

C, q, U inc
V,E same

Question 36

Battery disconnected

Answer 36

C inc
q same
E,V,U dec

Question 37

Energy density of capac

Question 38

Capac w dielectric of thickness t

Question 39

factors affecting capacitor

Answer 39

size n shape
nature of surrounding
presence of other conductors

Question 40

Common potential

Answer 40

C1V1+C2V2 = (C1+ C2) V