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Q.

The diagrams below show regions of equipotentials.A positive charge is moved from A to B in each diagram.
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a

Maximum work is required to move q in figure (b)

b

Maximum work is required to move q in figure(c)

c

In all the cases the work done is the same.

d

Minimum work is required to move q in figure(a)

answer is C.

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Detailed Solution

In all the cases the work done is the same.
Work done = Change in potential energy
So in all cases, from moving A to B change in potential is same
Hence work done will be same.

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The diagrams below show regions of equipotentials.A positive charge is moved from A to B in each diagram.