An ac source of angular frequency is fed across a resistor r and a capacitor C in series. The current registered is I. If now the frequency of source is changed to /3 (but maintaining the same voltage), the current in then circuit is found to be halved. Calculate the ratio of reactance to resistance at the original frequency
At angular frequency , the current in RC circuit is given by
......(i)
Also ......(ii)
From equation (i) and (ii) we get