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Q6. A coil of inductance 2 H and unknown resistance is connected to a D.C. supply of 100 volts. After 4 ms the current has risen to 75% of its final steady state value. Calculate EACH of the following:

(a) The resistance by the coil. (6)

(b) The energy stored in the coil when the current has reached its steady state value. (6)

(c) The time taken for the current to fall to 50% of its steady state value when the supply is switched off. (4)