Circuit Theory - Transient Analysis

In the circuit given below, the switch S was kept open for a sufficiently long time and is closed at time t = 0. The time constant (in seconds) of the circuit for t > 0 is _________.

In the circuit shown below, switch S was closed for a long time. If the switch is opened at t = 0, the maximum magnitude of the voltage VR, in volts, is ________ (rounded off to the nearest integer).

The switch S₁ was closed and S₂ was open for a long time. At t = 0, switch S₁ is opened and S2 is closed, simultaneously. The value of i_c(0+), in amperes, is