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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: - A wheel has moment of inertia 5 x 10⁻³ kgm² and is making 20 revolutions per sec
- Wires A and B are made from the same material. A has twice the diameter and three times
- A spherical drop of mercury having a potential of 2.5 v is obtained as a result
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A wheel has moment of inertia 5 x 10⁻³ kgm² and is making 20 revolutions per sec
- Wires A and B are made from the same material. A has twice the diameter and three times
- A spherical drop of mercury having a potential of 2.5 v is obtained as a result
- A thin glass(refractive index 1.5) lens has optical power of -5D in air.
- During an adiabatic process, the cube of the pressure is found to be inversely
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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