A light bulb and an inductor coil are connected to AC source through a key as shown in the figure below. The key is closed and after sometime an iron rod is inserted into the interior of the inductor. The glow of the light bulb [NEET 2020]
Text Solution
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When an iron rod is inserted into the interior of the inductor, then inductance (L) of the coil increases.
Hence, inductive reactance ( 
) also increases.
Current in the circuit is given as 
Hence, when X L increases, then current I decreases.
Therefore, glow of the light bulb will decrease.
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