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The capacitance of a variable radio capa...

The capacitance of a variable radio capacitor can be cahanged from `50pF` to `200pF` by turning the dial from `0^(@)` to `180^(@)`. With the dial set at `180^(@)`, the capacitor is connected to a `400V` battery. After cahrging, the capacitor is disconnected from the battery and dial is tuned at `0^(@)`?
(a) what is the `p.d.` across the capacitor when dial reads `0^(@)`?
(b) how much work is required to turn the dial, if friction is naglected?

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