A coil has resistance 30 ohm and inductive reactance 20 Ohm at 50 Hz frequency. If ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will be

Question

Dr. Abubacker · Accepted Answer

(c) If $\omega = 50 	imes 2\pi$ then $\omega L = 20\Omega$
If $\omega^{'} = 100 	imes 2\pi$ then $\omega^{'}L = 40\Omega$
$I = \frac{200}{Z} = \frac{200}{\sqrt{R^{2} + \left( \omega^{'}L ight)^{2}}} = \frac{200}{\sqrt{(30)^{2} + (40)^{2}}}$
$I = 4\ A$

Q. A coil has resistance 30 ohm and inductive reactance 20 Ohm at 50 Hz frequency. If ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will be

Explanation

Reviewed by Dr. Abubacker

Want more practice?