CUET · PHYSICS · PYQ PAPER 2023
A light bulb and an air core inductor are connected in series to an a.c. source through a switch. The switch is closed and after sometime, an iron rod is inserted into the interior of the inductor. The light bulb
- A glows with less brightness
- B glows with more brightness
- C glows with same brightness
- D does not glow
Answer & Solution
Correct Answer
(A) glows with less brightness
Step-by-step Solution
Detailed explanation
Iron rod insertion \(\implies\) Inductance (\(L\)) \(\uparrow\). Inductive reactance (\(X_L = 2\pi f L\)) \(\uparrow\). Circuit impedance (\(Z = \sqrt{R^2 + X_L^2}\)) \(\uparrow\). Current (\(I = V/Z\)) \(\downarrow\). Brightness (\(P = I^2 R\)) \(\downarrow\). The light bulb…
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