An uncharged 30.0-F capacitor is connected in series with a 25.0- resistor, a DC battery, and an open switch. The battery has an internal resistance of 10.0 and the open-circuit voltage across its terminals is 50.0 V.
The leads have no appreciable resistance. At time t = 0, the switch is suddenly closed.
(a) What is the maximum current through the 25.0- resistor and when does it occur (immediately after closing the switch or after the switch has been closed for a long time)?
(b) What is the maximum charge that the capacitor receives?
(c) When the current in the circuit is 0.850 A, how much charge is on the plates of the capacitor?
Question 2
A wire, 6.0 m long, with a mass of 10 g, is under tension. A transverse wave is propagated on the wire, for which the frequency is 280 Hz, the wavelength is 0.60 m, and the amplitude is 8.4 mm.
The time, for a crest of the transverse wave to travel the length of the wire, in ms, is closest to: A) 36
B) 31
C) 40
D) 44
E) 49
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