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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 ↓
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- A 50Hz AC signal is applied in a circuit of inductance of (1/π)H and resistance 2100Ω
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A student performs an experiment to determine the Young’s modulus of a wire
- A 50Hz AC signal is applied in a circuit of inductance of (1/π)H and resistance 2100Ω
- A particle moves with constant speed v along a circular path of radius r and completes
- If the sodium light in Young’s double slit experiment is replaced by red light
- Three capacitors 3μF,6μF and 6μF are connected in series to a source of 120V.
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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