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In the circuit of the figure below, the switch S has been open for a long time. It is then suddenly closed. (Use the following as necessary: E for E, R,, R,, t, and C.)
R1
R2
(a) Determine the time constant before the switch is closed.
(R1 + R2)C
(b) Determine the time constant after the switch is closed.
(R2)C
T =
(c) Let the switch be closed at t = 0. Determine the current in the switch as a function of time.
一劍
I =
R,
R.

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