Question

7. A spherical surface of radius 20cm is centered
on a point charge and is at a potential 20V. A
charge of 50nC is moved on the surface
between two diametrically opposite points. The
work done is
(A)10-7
(B)2.5x10-
(C)Zero
(D)None of these​

Answer 1

Answer:

2.5× 10- is the correct answer

Answer 2

Potential at surface = 50 V

V=

R

K.Q

50=

0.1

K.Q

KQ= 5

potential at 200 m from centre

V=

r

K.Q

V=

0.2

5

= 25 volt