O An electric circuit contains an electromotive force E of 150 cos 201 volts, a resistance R of 20 ohms, an inductance L of 0.1 henry and a capacitance C of 0.01 farad, where t is the time (in seconds). The differential equation satisfied by the charge Q for the circuit is d?Q dQ L + R + dt2 dt 1 E(t) Find the charge, Q at the time t. Note: Apply the method of solving second order differential equation learnt in the unit.

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