work done by external agent

{Shastras Q-21}
a point charge q is brought from infinity and is placed at the center of a conducting neutral spherical shell of inner radius 'a' and outer radius 'b', then work done by external agent is.

A}0
B}kq2/2b
C}kq2/2b - kq2/2a
D}kq2/2a - kq2/2b

3 Answers

1163
Akash Anand ·

There will be correction in C option. There won't be any two in denominator for both the terms.

283
Sahil Jain ·

a

156
Rajiv Agarwal ·

When you bring a charge and place it at the centre, then it will induce charges on the spherical shells. From there try and get the answer.

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