ELECTROSTATIC POTENTIAL AND CAPACITANCE

Question 1

WORK DONE

Answer 1

W = F X D

Question 2

ELECTROSTATIC POTENTIAL ENERGY

Answer 2

U = KQq/ r

Question 3

ELECTROSTATIC POTENTIAL DIFFERENCE

Answer 3

🔺️ U = Up - Ur = Wrp

Question 4

ELECTROSTATIC POTENTIAL

Answer 4

Vp - Vr = Up - Ur / q

V = Kq/r

Question 5

POTENTIAL DIPOLE

1. AXIAL
2. EQUITORIAL

Answer 5

Vp = kpcos o/ r^2
1. kq/r^2 - a^2

kq/r^2 ( a is negligible)

2. 0

Question 6

EQUITPOTENTIAL SURFACE WORK DONE

Answer 6

0

Question 7

ELECTRIC FIELD AND POTENTIAL

Answer 7

E = -dv/dr

Question 8

EQUIPOTENTIAL SURFACE ARE PERPENDICULAR TO

Answer 8

ELECTRIC FIELD

Question 9

POTENTIAL ENERGY OF A SYSTEM OF 2 CHARGES

Answer 9

U = KQ1Q2/R12

Question 10

1. E.F INSIDE CONDUCTOR
2. at surface
3. what charge is in interior of conductor
4. Electrostatic potential throughout volume

Answer 10

1. 0
2. normal to all points
   E = SIGMA/eo
3. no excess charge
4. constant

Question 11

Dielectric in an external field

Answer 11

E = Eo - Ep

sigma p = sigma o ( 1- 1/k)

Eo = external field
Ep = polarizied field
E = net field

Question 12

Polarization

Answer 12

P= Qp d
p = sigma p Ad
p (vect) = sigma p
p = xo E (vec)

(Xo = (K-1)eo
K=1+Lambda

Question 13

Capacitance

Answer 13

Q=CV

Question 14

Electrical displacement

Answer 14

D= eoE+p
D= eokE

Question 15

SPHERICAL CAPACITOR

Answer 15

C = R/K

Question 16

Concentric Spherical Capacitor

Answer 16

C = ab/ k (b-a)

Question 17

Cylindrical Capacitor

Answer 17

C = l/2k (ln b/a)

Question 18

Parallel Plate Capacitor

Answer 18

C = A eo/ d

Question 19

Dielectric on Capacitor (completely filled)

Answer 19

C = K Aeo / d
C = KCo

Question 20

Combination of capacitor

1. Series
2. Parallel

Answer 20

1. 1/C = 1/C1 + 1/C2 ……

2. C = C1 + C2….

Question 21

Energy stored in the capacitor

Answer 21

U= Q^2/ 2C
U = 1/2 CV^2
U = 1/2 QV

Question 22

energy density

Answer 22

u = 1/2 eo E^2