In the A.C. circuit shown, keeping ' 
' pressed, if an iron rod is inserted into the coil, the bulb in the circuit
Text Solution
Verified by ExpertsThe correct answer is:
B
As the iron rod is inserted, the magnetic field inside the coil magnetizes the iron increasing the magnetic field inside it. Hence, the inductance of the coil increases. As a result, a larger fraction of the applied ac voltage appears across the inductor, leaving less voltage across the bulb. Therefore, the bulb glows less brightly.
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