Question

A parallel plate capacitor is connected to a battery as shown in figure. Consider two situations
(i) key K is kept closed and plates of capacitors are moved apart using insulating handle
(ii) key k is opened and plates of capacitors are moved apart using insulating handle.
Which of the following statement is correct?

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A

In (i), Q remains same but C changes.

B

In (ii), V remains same but C changes.

C

In (i), V remains same hence Q changes.

D

In (ii) both Q and V changes.

Medium

Solution

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Correct option is C)

The battery maintains the potential difference across connected capacitor in every circumstance. However, charge stored by disconnected charged capacitor remains conserved.

When key is kept closed and plates of capacitors are moved apart using insulating handle.
The battery maintains the potential difference across connected capacitor in every circumstance. The separation between two plates increases which in turn decreases its capacitance and potential difference across
connected capacitor continue to be the same as capacitor is still connected with battery. Hence, the charge stored decreases as

When key is opened and plates of capacitors are moved apart using insulating handle.
The charge stored by isolated charged capacitor remains conserved. The separation between two plates is increasing which in turn decreases its capacitance with the decrease of capacitance, potential difference increases as .

Solve any question of Electrostatic Potential and Capacitance with:-

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