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Question

The work done against electric forces in increasing the potential difference of a condenser from 20 V to 40 V is W. The work done in increasing its potential difference from 40 V to 50 V will be

A
4W
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B
3W4
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C
2W
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D
W2
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Solution

The correct option is D W2
w=qΔvwhere,q=cheΔv=potentialdifferencew=q(4020)w=q(5040)ww=2010Hence,w=w2optionDiscorrectanswer.

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