When 100 V DC is applied across a coil, a current of 1 A flows through it. When 100 V AC of 50 Hz is applied across the same coil, only 0.5 A flows. The resistance and inductance are:
a) 50 ohms, 2.5 H
b) 100 ohms, 2 H
c) 100 ohms, 0.5 H
d) 50 ohms, 0.25 H
