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(a)The electric mains in a house is marked as 220 V , 50 Hz . Write...

(a)The electric mains in a house is marked as 220 V , 50 Hz . Write down the equation for the instantaneous voltage. (b) The equation of AC for a circuit is given by : I = 50 cos 100  t Find (i) frequency of ac applied (ii) mean value of current during positive half of the cycle (iii) the value of the current 1/300 seconds after it was zero.

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