The capacitance of a variable radio capacitor can be changed from 50PF to 95PF by turning the dial from 0 to 180 degrees. With the dial set at 180 degrees , the capacitor is connected to a 400V battery. After charging the capacitor is disconnected from the battery and the dial is turned to 0 degrees.
a - What is the charge on the capacitor
b- What is the p.d across the capacitor when the dial reads 0 degrees.
c - WHat is the energy of the capacitor in this position?

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