All Problems

Electric Oscillations

Problem 4.133

A circuit consisting of a capacitor and a coil connected in series is fed two alternating voltages of equal amplitudes but different frequencies. The frequency of one voltage is equal to the natural oscillation frequency (ω0)\left(\omega_{0}\right) of the circuit, the frequency of the other voltage is η\eta times higher. Find the ratio of the current amplitudes (I0/I)\left(I_{0} / I\right) generated by the two voltages if the quality factor of the system is equal to Q.Q . Calculate this ratio for Q=10Q=10 and 100,100, if η=1.10.\eta=1.10 .

Reveal Answer
I0/I=1+(Q2+1/4)(η21)2/η2,2.2 and 19 respectively. I_{0} / I=\sqrt{1+\left(Q^{2}+1 / 4\right)\left(\eta^{2}-1\right)^{2} / \eta^{2}}, 2.2 \text { and } 19 \text { respectively. }