Questions
A light bulb and an inductor coil are connected to an ac source through a key as shown in the figure below. The key is closed and after sometime an iron rod is inserted into the interior of the inductor. The glow of the light bulb
detailed solution
Correct option is B
As an iron rod is inserted, inductance of inductor will increase. Hence impedance z=R2+(ωL)2will increase, so from i=vzcurrent will decrease and from P=V02R2z2power of bulb will decrease.Talk to our academic expert!
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An LCR series circuit with a resistance of 100 ohm is connected to an ac source of 200 V (r.m.s.) and angular frequency 300 rad/s. When only the capacitor is removed, the current lags behind the voltage by 60o . When only the inductor is removed the current leads the voltage by 60o . The average power dissipated is
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