A capacitor consisting of two parallel plates, separated by a distance d is init

Question

A capacitor consisting of two parallel plates, separated by a distance d is initially charged to a voltage of 4.1 V. The battery is then disconnected from the capacitor. For each statement below, select True or False.

True False  If the battery is disconnected, and then the distance d between the plates is increased, the voltage across the capacitor will decrease.
True False  Increasing the distance d after disconnecting the battery will increase the electrical energy stored in the capacitor.
True False  If the battery is disconnected, and then the distance d between the plates is increased, the amount of charge stored on either plate of the capacitor will change.

Explanation / Answer

1. as battery disconnected, constant charge. on increasing d, capacitance decrease.=> CV = constant

=> voltage increases => False

2. s battery disconnected, constant charge. on increasing d, capacitance decrease => 2EC = Q2 =constant

=> Energy increases => True

3. charge will not change. => False

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