If the time constant of a coil is measured and found to be 50 ms, what will be its inductance if it has a resistance of 2 Ω? When a DC voltage of 100 V is applied to the feld coil of a machine, after...

If the time constant of a coil is measured and found to be 50 ms, what will be its inductance if it has a resistance of 2 Ω?

When a DC voltage of 100 V is applied to the feld coil of a machine, after 2 s the current has risen to 6.32 A and eventually it reaches 10 A. What is the inductance of the coil?