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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 120 V battery whose negative is earthed. The energy stored in the system is

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The correct Answer is:
`(i) (30pi in_(0))/(49)~~17pF " " (ii) 122.4 nJ`
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RESONANCE ENGLISH-CAPACITANCE-High Level Problems
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