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A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when
Options
(a) number of turns in the coil is reduced
(b) a capacitance of reactance Xc = Xl is included in the same circuit
(c) an iron rod is inserted in the coil
(d) frequency of the AC source is decreased
Correct Answer:
an iron rod is inserted in the coil
Explanation:
By inserting iron rod in the coil, L ↑ z ↑ I ↓ so brightness ↓
Related Questions: - In the given figure, a diode D is connected to an external resistance R=100 Ω
- Which of the following is not a transverse wave?
- Fission of nuclei is possible because the binding energy per nucleon in them
- If the value of potential in an A.C circuit is 10 V, the peak value of potential is
- If a small sphere is let fall vertically in a large quantity of still liquid of density
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In the given figure, a diode D is connected to an external resistance R=100 Ω
- Which of the following is not a transverse wave?
- Fission of nuclei is possible because the binding energy per nucleon in them
- If the value of potential in an A.C circuit is 10 V, the peak value of potential is
- If a small sphere is let fall vertically in a large quantity of still liquid of density
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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