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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 Young’s experiment, the ratio of maximum to minimum intensities of the fringe
- Heat is flowing through a rod of length 50 cm and area of cross-section 5 cm².
- Three identical spheres, each of mass 3 kg are placed touching each other
- On observing light from three different stars P, Q and R, it was found that intensity
- what is the electric potential at a distance of 9cm from 3nC?
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In Young’s experiment, the ratio of maximum to minimum intensities of the fringe
- Heat is flowing through a rod of length 50 cm and area of cross-section 5 cm².
- Three identical spheres, each of mass 3 kg are placed touching each other
- On observing light from three different stars P, Q and R, it was found that intensity
- what is the electric potential at a distance of 9cm from 3nC?
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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