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An electric dipole is fixed at the origi...

An electric dipole is fixed at the origin of coordinates. Its moment is directed in the positive `x`- direction. A positive charge is moved from the point `(r,0)` to the point `(-r,0)` by an external agent. In this process, the work done by the agent is

A

positive and inversely proportional to r

B

positive and inversely proportional to `r^2`

C

negative and inversely proportional to r

D

negative and inversely proportional to `r^2`

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The correct Answer is:
D
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