TS EAMCET · Physics · Alternating Current
An electric bulb, an open coil inductor, an ac source and a key are all connected in series to form a closed circuit. The key is closed and after some time an iron rod is inserted into the interior of the inductor, then
- A The glow of the bulb increases
- B The glow of the bulb remains unchanged
- C The glow of the bulb decreases
- D The bulb does not glow
Answer & Solution
Correct Answer
(C) The glow of the bulb decreases
Step-by-step Solution
Detailed explanation
Iron rod increases inductance \(L\). Inductive reactance \(X_L = 2 \pi f L\) increases. Total impedance \(Z = \sqrt{R^2 + X_L^2}\) increases. Current \(I = V/Z\) decreases. The glow of the bulb decreases.
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