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When a parallel plate capacitor is conne...

When a parallel plate capacitor is connected across a d.c. battery. Explain briefly how the capacitor gets charged .

Text Solution

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When a parallel plate capacitor is connected to a battery, positive charge from + ve terminal of battery flows and charge the plate A of the capacitor . As plate B of capacitor is close to plate A , an equal amount of negative charge is induced on inner surface of plate B and positive charge is induced on outer surface of plate B . However , negative charge coming from -ve terminal of battery nullifies thi positive charge of outer surface of plate B .
Thus , effectively we get equal and opposite charges on inner surfaces of plates A and B of the capacitor and we say that the capacitor is charged .
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Knowledge Check

  • The plates S and T of a uncharged parallel plate capacitor are connected across a battery. The battery is then disconnected and the charged plates are now connected in a system as shown in the figure. The system shown is in equilibrium. All the strings are insulating and massless. the magnitude of charge on one of the capacitor plates is: [Area of plates = A ]

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  • A parallel plate air capacitor is connected to a battery. If plates of the capacitor are pulled farther apart, then which of the following statements is/are correct ?

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    C
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    D
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