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

`0.1224 mu J`

`0.2224 mu J`

`0.3224 mu J`

`0.4224 mu J`

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Two circular plates A and B of a parallel plate air capacitor have a diameter of 0.1m and are 2xx10^(-3) m apart. The plates C and D , of a similar capacitor have a diameter of 0.12m and are 3xx10^(-3)m apart. Plate A is earthed and plates B and D are connected together as shown in figure. Plate C is connected to the positive pole of a 120V battery whose negative terminal is earthed. Calculate. (a) the combined capacitance of the arrangement and (b) the energy stored in it.

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