3. (a) An inductor of inductance 2 H and a resistance 10 ( is connected to a battery of 40 V. 4 Find () the initial rate of increase of current in the circuit (ii) the rate of increase current at the instant when the current is 3 A (ii) the current 0.6 s after the circuit is closed (iv) the time required to increase the current to 63 % of its final value