need help with RC circuit physics?

Question

http://class.phys.psu.edu/SampleExams/p212SampleExams/MT2/p212_MT2_S1.pdf

questions 13-15

Answer 1

13: (a) 0 A. Immediately after the switch closes the cap looks like a short.

14: (c) 2A A long time after the switch is closed the cap looks like an open. Using V=I*R 120/60=2

15: When the switch opens the cap discharges according to the time constant along an exponential. One time constant =R*C, which is the 37% point
(b) R*C=2 ms

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