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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: - which of the following can not be emitted by radioactive substances during their decay?
- The ultimate individual unit of magnetism in any magnet is called
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- which of the following can not be emitted by radioactive substances during their decay?
- The ultimate individual unit of magnetism in any magnet is called
- One mole of an ideal diatomic gas undergoes a transition from A to B along a path
- The voltage gain of an amplifier with 9% negative feedback is 10.
- In Young’s double slit experiment with sodium vapour lamp of wavelength
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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