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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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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The electric field part of an electromagnetic wave in a medium is represented by
- Ice is wrapped in black and white cloth. In which cases more ice will melt
- A uranium nucleus ₉₂ U ²³⁸ emits an α-particle and a β-particle in succession.
- The molecular weight of a gas is 44. The volume occupied by 2.2 g of this gas
- In producing chlorine through electrolysis 100 watt power at 1125 V is being
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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