A parallel plate capacitor with plate separation d is connected to a battery. Th

Question

A parallel plate capacitor with plate separation d is connected to a battery. The capacitor is fully charged to Q Coulombs and a voltage of V. fC is the capacitance and U is the stored energy.) Answer the following questions regarding the capacitor charged by a battery. For each statement "below, select True or False. With the capacitor connected to the battery, increasing d increases C. After being disconnected from the battery, increasing d decreases V. After being disconnected from the battery, increasing d increases U. After being disconnected from the battery, inserting a dielectric with K will increase U. After being disconnected from the battery, inserting a dielectric with k will decrease C. After being disconnected from the battery, inserting a dielectric with k will increase V.

Explanation / Answer

1) false

Becasue, C = A*epsilon/d

so, as d increases, C decreases.

2) False

Q = C*V

after disconning Q remains same.

we know, as d increases C decreases.

so, as C decreases V increases.

3) True

U = Q^2/(2*C)

As C decreases, U increases.

4) False

when dielctric is inserted C increases.

so, U decreases.

5) False

C = k*A*epsilon/d

so, C increases

6) False

Q = C*V

As C increases V decreases.

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