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Cool goIITian

Joined:	8 Apr 2009
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15 May 2009 20:32:13 IST

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The hollow non conducting spheres of radius r seprated by a distance 2a and having charge +q and -q

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The hollow non conducting spheres of radius r seprated by a distance 2a and having charge +q and -q .If they r moved apart to a distance 4a and while moving their radil also expended to double the initial value. W ork done by external force is doing so is ???

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sanchit says ""Imagination has its own reality""

Blazing goIITian

Joined: 6 Jul 2007

Posts: 510

15 May 2009 20:36:48 IST

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i think k*q*q / 4a

aryaman

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Joined: 13 Nov 2008

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16 May 2009 21:11:59 IST

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kq²a²/4

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