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Question

A point charge q is brought form infinity and is placed at the centre of a conducting neutral spherical shell of inner radius a and outer radius b, then work done by external agent is:
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A
0
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B
kq22b
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C
kq22bkq22a
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D
kq22akq22b
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Solution

The correct option is A 0
vi=q4πε0a
v0=(q4πε0b)
v=q4πε0(1b1a)
W=Ep=qv=q24πε0(1b1a)

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