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A Lamp is Connected in Series with an Inductor and an Ac Source. What Happens to the Brightness of the Lamp When the Key is Plugged in and an Iron Rod is Inserted Inside the Inductor - Physics

A lamp is connected in series with an inductor and an AC source. What happens to the brightness of the lamp when the key is plugged in and an iron rod is inserted inside the inductor? Explain.

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Solution

If an iron rod is inserted in the inductor, then the value of inductance L increases. As such, the current through the bulb will decrease, thus, decreasing the brightness of the bulb.

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