A series RC circuit has a resistance of 15 kΩ and a capacitance of 0.02 μF and a steady voltage of 30 V is connected to the circuit. Determine (a) the time constant τ of the circuit, (b) the current...

A series RC circuit has a resistance of 15 kΩ and a capacitance of 0.02 μF and a steady voltage of 30 V is connected to the circuit. Determine (a) the time constant τ of the circuit, (b) the current after 1τ, (c) the current after 1.5τ, (d) the steady state current.