A lamb in which 10 A current can flow at 15 V is connected with an alternating source of potential 220 V and frequency 50 Hz. What should be the inductance of choke coil required to light the bulb?
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Sol. Resistance of the lamp, 
To send 10 A current through the lamp. Required impedance of the ac circuit, 
Now if 
be the inductance of the choke coil and its resistance is negligible, then
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