A series circuit contains an 80-?F capacitor, a 0.020-H inductor, and a switch. The resistance of the circuit is negligible. Initially, the switch is open, the capacitor voltage is 50 V,
and the current in the inductor is zero. At time t = 0 s, the switch is closed. When the current in the circuit is 1.5 A, what is the charge on the capacitor?
A) 2000 µC
B) 2500 µC
C) 3000 µC
D) 3500 µC
E) 4000 µC
D
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The frequency in an AC series circuit is quadrupled. By what factor does this change the capacitive reactance?
a. 1/4 b. 1/16 c. 4 d. 16 e. 1
RC Circuits: A resistor, an uncharged capacitor, a dc voltage source, and an open switch are all connected in series. The switch is closed at time t = 0 s. Which one of the following is a correct statement about this circuit?
A. The charge on the capacitor after four time constants is about 98% of the maximum value. B. The charge on the capacitor after one time constant is 50% of its maximum value. C. The charge on the capacitor after one time constant is 1/e of its maximum value. D. The voltage on the capacitor after one time constant is 1/e of the maximum value. E. The voltage on this capacitor after one time constant is 100% of its maximum value.
Suzie Skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration
A) increases. B) decreases. C) remains unchanged regardless of air resistance.
In expressions like ?v and ?t, ? stands for _________
Fill in the blank(s) with correct word