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  4. A light bulb and an inductor coil are connected to an 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 <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/da7f16cdd35fbc8f04d3ecf23cd53f6f-.png />

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Q. A light bulb and an inductor coil are connected to an 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
image

NEETNEET 2020Alternating Current

Solution:

$z=\sqrt{R^{2}+X_{L}^{2}}$
$X_{L} \ce{^}, Z \ce{^}, I ↓$