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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 a compound microscope, the focal length of the objective is 2.5 cm and of eye lens
- To observed diffraction, the size of the obstacle
- When a metallic surface is illuminated with radiation of wavelength λ,
- Two particles A and B having equal charges, after being accelerated
- Initial pressure and volume of a gas are P and 800cc. If the final volume is 100cc
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In a compound microscope, the focal length of the objective is 2.5 cm and of eye lens
- To observed diffraction, the size of the obstacle
- When a metallic surface is illuminated with radiation of wavelength λ,
- Two particles A and B having equal charges, after being accelerated
- Initial pressure and volume of a gas are P and 800cc. If the final volume is 100cc
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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