electrostatic and capacitance

Question 1

electric potential at infinity

Answer 1

zero

Question 2

electric potential is put with sign or not

Answer 2

yes, it is put with sign of charge

Question 3

electric potential formula

Answer 3

V=(K*Q)/R

Question 4

electric potential at axis of uniform charged RING

Answer 4

V=kQ/(x^2 + r^2)^1/2

Question 5

electric dipole moment

Answer 5

p=2l*q

Question 6

electric potential of dipole at perpendicular bisector=

Answer 6

zero

Question 7

relation between field and potential

Answer 7

v(1-2)= -E.r

Question 8

units of electric field

Answer 8

N/m , V/m

Question 9

Electric field inside hollow sphere and in conducting solid sphere is

Answer 9

Zero due to guass law

Question 10

Inside hollow sphere and solid conducting sphere the potential is

Answer 10

Constant everywhere

Question 11

Electric potential for solid and hollow sphere outside the surface is

Answer 11

V= KQ/R

Question 12

Electric potential inside and outside are

Answer 12

Inside=Kq/R
Outside=Kq/r

Where R is radius of sphere
And r is distanve of position from centre

Question 13

For concentric sphere , potential at shell B is

Answer 13

V due to A + V due to B + V due to C

Question 13

For concentric sphere , potential at shell B is

Answer 13

V due to A + V due to B + V due to C

Question 14

On earthing the potential of the conductor becomes

Answer 14

Zero but it is not necessary for the charge to be zero

Question 15

capacitance formula

Answer 15

C=Q/V

Question 16

Capacotance of spherical capacitor

Answer 16

C= 4× PI×E0×R

Question 17

Energy stored in spjerical capacitor

Answer 17

Wext= Q^2/2C

Question 18

Energy stored in spjerical capacitor

Answer 18

Wext= Q^2/2C

Question 19

Capacitance of parallel plate capacitor

Answer 19

C=Q/delta V

Question 20

Electric field between plates in parallel plate capacitors

Answer 20

Enet = Q/A×E0

Question 21

Force on one plate due to other

Answer 21

F=Q^2/2AE⁰

Question 22

Series combination of capacitors

Answer 22

Charge is same
Potential is different Q/C¹, Q/C²
1/Ceq =1/C¹ + 1/C²

Question 23

potential energy

Answer 23

u= k q1*q2/r

Question 24

effect of dielectric on capacitance

Answer 24

C=KC’

Question 25

partially filled dielectric constant

Answer 25

C= Ae/(d-t+t/k)

where A is area of plate
e is ephsilon
d is distance between plates
t with of partially filled dielectric
k is dielectric

Question 26

By a potentiometer,

Answer 26

Vreq = v*x/l

where v is emf of cell
x is distance from start
l length of potentiometer

Question 27

Value of Ę(ephsilon not)

Answer 27

Ę = 8.85 ×10^-12

Question 28

Si unit of flux

Answer 28

Ø = Nm^2/C