Question

Figures (a) and (b) show two alternating circuits with equal currents. If frequency of alternating emf be increased, what will be the effect on maximum currents in the two cases?

Answer 1

Ref image

$E=E_0\sin \omega t$

$I=I_0\sin \omega t$

$I=\frac{E_0}{R}\sin \omega t$

current does not depend on varying frequency

Ref. image

$E=E_0\sin \omega t$

$I=\frac{E_0}{x_2}\sin (\omega t-\frac{\pi }{2})$

$I=\frac{E_0}{\omega L}\sin (\omega t-\frac{\pi }{2})$

If $\omega$ is increased the value of 3 will decrease.