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Question

Consider the configuration of a system of four charges each of value +q. Find the work done by external agent in changing the configuration of the system from figure (a) to figure (b).
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Solution

U1=Kq2{1a+12a+1a+1a+12a+1a}
=Kq2{4a+22a}
U2=Kq2{12a+12a+12a+12a+12a+12a}
U2=Kq2{22a+42a}
W={U1U2}=Kq2{4+2a}Kq2{1+22a}
W=Kq2{4+2122a}
W=Kq2{32a}

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