1. A parallel plate capacitor of plate area A and plate separation d is charged by a battery of voltage V. The battery is then disconnected. The work needed to pull the plates to a separation 2d is 2. One plate of a parallel plate capacitor of plate area A and plate separation d is connected to the positive terminal of a battery of the voltage V. The negative terminal of the battery and the other plate of the capacitor are earthed as shown in Fig. 11.75. The charge that flows from the battery to the capacitor plates is
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