A parallel plate capacitor is connected to a battery as sho…

Physics Electrostatics Potential & Capacitance Capacitance MCQ (Single Correct)

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 statements is correct?

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

In (ii) V remains same but C changes.

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

In (ii) both Q and V changes.

Text Solution

Verified by Experts

The correct answer is:

When key K is kept closed, condenser C is charged to potential V. when plates of capacitors are moved

Apart, its capacitance, decreases

As potential of condenser remains same, charge decreases. So option is correct.

Once key K is closed, condenser gets charged, Q = CV

Now, if key K is opened, battery is disconnected, no more charging can occur i.e. Q remains same. As plates of capacitor are moved its capacity

decreases.

Therefore, its potential, increases.

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