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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: - In cyclotron, for a given magnet, radius of the semicircle traced by positive ion
- Two capacitors of capacitances 2 μF and 3 μF are joined in series.
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In cyclotron, for a given magnet, radius of the semicircle traced by positive ion
- Two capacitors of capacitances 2 μF and 3 μF are joined in series.
- Two bullets are fired simultaneously, horizontally and with different speeds
- A potentiometer wire of length L and a resistance r are connected in series with
- An engine has an efficiency of 1/6. When the temperature of sink is reduced
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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