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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: - If the earth shrink such that its mass does not change but radius decreases to one
- The power supplied by a force acting on a particle moving in a straight line
- Time period of the rotation of the earth about its own axis is 24 hour
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If the earth shrink such that its mass does not change but radius decreases to one
- The power supplied by a force acting on a particle moving in a straight line
- Time period of the rotation of the earth about its own axis is 24 hour
- The energy required to charge a parallel plate condenser of plate separation d
- A soap bubble oscillates with time period T, which in turn depends on the pressure
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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