Question

22.
A point charge q is kept at A. The potential at point
Pat distancer from it is V and twice of this charge
is distributed uniformly on the surface of a hollow
sphere of radius 4r with centre at point A, the total
potential at point P is :-
3V
(1) V
(2)
V
2
(3)
(4)
2
8​

Answer 1

Answer:

Potential at P due to point charge is V=

r

kq

Since radius of hollow sphere is R=4r so point P inside the hollw sphere.Now the potential at P =V

in

=V

surface

=

R

k(2q)

=

4r

2kq

=

2r

kq

=V/2