As per this diagram a point charge $ + q$ is placed at the origin $O$. Work done in taking another point charge $ - Q$ from the point $A$ [co-ordinates $(0,\,a)$] to another point $B$ [co-ordinates $(a, 0)$] along the straight path $AB$ is
AIPMT 2005, Easy
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(a)Since $A$ and $B$ are at equal potential so potential difference between $A$ and $B$ is zero. Hence $W = Q.\Delta V = 0$
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