Questions
A coil has resistance 30 ohm and inductive reactance 20 ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz, is connected across the coil, the current in the coil will be
detailed solution
Correct option is B
Here, Resistance, R=30Ω Inductive reactance, XL=20Ω at 50Hz ∵ XL=2πvL XL′=v′v×XL=10050×20Ω=40Ω Impedance, Z=R2+XL′2=(30)2+(40)2=50Ω Current in the coil, I=VZ=200V50Ω=4ATalk to our academic expert!
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In the series LCR circuit as shown in figure, the heat developed in 80 seconds and amplitude of wattless current is:
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