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  • A parallel plate capacitor is connected to a battery as shown in the figure. Consider two situations: A: Key K is kept closed and plates of capacitors are moved apart using the insulating handle

A parallel plate capacitor is connected to a battery as shown in the figure. Consider two situations:

A: Key K is kept closed and plates of capacitors are moved apart using the insulating handle

B: Key K is opened, and plates of capacitors are moved apart using the insulating handle

Choose the correct options

a) In A: V remains the same and hence Q changes

b) In A: Q remains the same but C changes

c) In B: Q remains the same and hence V changes

d) In B: V remains the same but C changes

Answers (1)

Hence, the answer is the options (a,c).

Explanation:-

Key K closed means the capacitor is still connected to the battery while the plates are moved apart. In this case, the voltage V across the plates of the capacitor remains constant because the capacitor is connected to the battery, and the battery will maintain a constant voltage. 

  • Key K opened means the capacitor is disconnected from the battery and is no longer being supplied with charge.
  • In this case, charge Q remains constant because once the capacitor is disconnected, no more charge flows onto or off of the plates (the charge remains "frozen").

a) In A: V remains the same and hence Q changes

c) In B: Q remains the same and hence V changes

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infoexpert23

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