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Question
In an AC circuit with a bulb and inductor, what happens to the bulb’s brightness when an iron rod is inserted into the inductor?
Options
Decreases
Remains unchanged
Will fluctuate
Increases
MCQ
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Solution
Decreases
Explanation:
Due to insertion of an iron rod, inductance of the coil increases, thus increasing the impedance (Z) of the circuit and decreasing the current. Hence, brightness decreases.
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