Q.

The work done in increasing the P.D. across the plates of a capacitor from 4 V to 6 V is W. The further work done in increasing the P.D. from 6 V to 8 V is

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a

4W3

b

3W4

c

7W5

d

5W7

answer is C.

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Detailed Solution

w1w2=12CV22-V12112CV22-V122=62-4282-62ww2=36-1664-36=2028=57 ; w2=7w/5
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