CUET · PHYSICS · PYQ PAPER 2025
A light bulb and an air core inductor are connected to an AC source. The glow of the light bulb increases if
(A) the frequency of an AC source increases
(B) a copper rod is inserted inside the inductor
(C) the frequency of an AC source decreases
(D) an iron rod is inserted inside the inductor
Choose the correct answer from the options given below:
- A (A), (B) and (E) only
- B (B), (C) and (D) only
- C (C), (D) and (E) only
- D (B), (C) and (E) only
Answer & Solution
Correct Answer
(D) (B), (C) and (E) only
Step-by-step Solution
Detailed explanation
\( I = V/\sqrt{R^2 + X_L^2} \), where \( X_L = 2\pi fL \) For (C): \( f \downarrow \implies X_L \downarrow \implies \sqrt{R^2 + X_L^2} \downarrow \implies I \uparrow \). Glow increases. For (B): Copper rod \(\implies\) Eddy currents \(\implies\) Effective…
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