A coil with a resistance of 50 Ω and an inductance of 2.5 H has a d.c. voltage of 100 V connected across it. Determine (a) the time constant of the circuit, (b) the initial rate of change of current,...

A coil with a resistance of 50 Ω and an inductance of 2.5 H has a d.c. voltage of 100 V connected across it. Determine (a) the time constant of the circuit, (b) the initial rate of change of current, (c) the circuit current 0.15 s after the voltage is applied to the coil, (d) the final steady state current.

Determine by a graphical step-by-step method the current after 0.4 s when a voltage of 10 V is applied to a coil of resistance 25 Ω and inductance 5 H.