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Q3. A relay coil has resistance 24 W and inductance 2 H. It operates on 12 V d.c.

(a) Calculate the time after switching on the supply for the relay to close if it requires a current of 0.25 A to operate.

(b) Calculate the energy stored in the coil at the time of operation.

(C) Calculate the time delay before operation if a resistor of 6 o is connected in series with the relay coil and it is operated from 15 V supply.