A parallel plate capacitor with adjustible plate separation d and adjustible are

Question

A parallel plate capacitor with adjustible plate separation d and adjustible area A is connected to a battery. The capacitor is fully charged to Q Coulombs and a voltage of V Volts. (C is the capacitance and U is the stored energy.) Give all correct answers concerning a parallel-plate capacitor charged by a battery (e.g. B, AC, CDF).

A) With the capacitor connected to the battery, increasing the area A will increase Q.
B) After being disconnected from the battery, increasing d increases V.
C) After being disconnected from the battery, decreasing d increases U.
D) With the capacitor connected to the battery, increasing the area A will increase C.
E) After being disconnected from the battery, decreasing d decreases C.
F) After being disconnected from the battery, increasing the area A will decrease U.

Explanation / Answer

Q = CV

C = A/d

U = 0.5 x CV2

A) False (Decresing D, increases capacitance, Reduces voltage (charge remains constant) . U decreases.)

B) True (Increasing Area will increase capacitance)

C) True

D) True (Cpacitance increases, voltage decreases)

E) False ( Would increase U)

F) The question ain't complete. (d increases ??)

BCD

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