A parallel plate capacitor with adjustible plate separation d and adjustible are
ID: 2152253 • Letter: A
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