Consider two configurations in fig (i) and fig(ii)The work done by external agent in changing the configuration from fig(i) to fig(ii) is

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−6Gm2a1+12

−6Gm2a1−12

-6Gn2a2−12

answer is C.

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Detailed Solution

GPE=−Gm1m2r;W=GPE2−GPE1

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