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The circular plates A and B of a paralle...

The circular plates A and B of a parallel plate air capacitor have a diameter of 0.1 m and are `2 xx 10^(-3) m` apart. The plates C and D of a similar capacitor have a diameter of `0.12 m` and are `3 xx 10^(-3)m` apart. Plate A is earthed. Plates B and D are connected together. Plate C is connected to the positive pole of a 120V battery whose negative is earthed. The energy stored in the system is

A

`0.1224 mu J`

B

`0.2224 mu J`

C

`0.3224 mu J`

D

`0.4224 mu J`

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The correct Answer is:
A
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NCERT FINGERTIPS-PRACTICE PAPPER-Practice Paper 3
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