CUET · PHYSICS · PYQ PAPER 2025
In an ac circuit, a coil of self-inductance L is connected in series with an electric bulb of resistance R. If the frequency of ac supply increases, then
- A Impedance of the circuit decreases
- B Effective current in the circuit increases
- C Brightness of the bulb decreases
- D Phase difference between the current and the voltage decreases
Answer & Solution
Correct Answer
(C) Brightness of the bulb decreases
Step-by-step Solution
Detailed explanation
\(X_L = 2 \pi f L \implies \text{If } f \uparrow, X_L \uparrow\) \(Z = \sqrt{R^2 + X_L^2} \implies \text{If } X_L \uparrow, Z \uparrow\) \(I_{rms} = V_{rms}/Z \implies \text{If } Z \uparrow, I_{rms} \downarrow\)…
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