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

In all the four cases the work done is the same

b

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

c

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

d

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

answer is A.

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Detailed Solution

W =q∆Vas ∆V is same in all conditions, work 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 :