MHTCET 2016 Physics Solved Paper

(d) Work done in increasing the voltage from V1 to V2 is given by
=

1

2

C(V22−V12)
putting the values, we get
=

1

2

×C×(102−52)
W=

1

2

×C×75 =

75C

2

......(i)
Againwork done when the plate voltage is increased from 10 V to 15 V is given by
W1=

1

2

×C×(152−102)
W1=

1

2

×C×125 =

125C

2

......(ii)
Using eqs. (i) and (ii), we get

W

W1

=

75C

2×125C

×2 ⇒

W1

W

=

125

75

=

5

3

⇒ W1=1.67W