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There are four concentric shells A , B , C ,D of radii a , 2a ,3a and 4a respectively . Shells B and D are given charges +q and -q respectively . Shell C is now earthed . The potential difference $\;V_{A}-V_{C}\;$ is


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Answer : (d) $\;\large\frac{k\;q}{6a}$
Explanation :
$V_{C} = \large\frac{k\;q}{3a} +\large\frac{k\;q^{|}}{3a} -\large\frac{k\;q}{4a}$
answered Feb 7, 2014 by yamini.v

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