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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: - The current through an inductor changes from 3 A to 2 A is 1 m/s. If induced e.m.f.
- Two spheres of mass m and M are situated in air and the gravitational force
- Which one of the following statements is not correct in case of a semiconductor?
- A radiation of energy ‘E’ falls normally on a perfectly reflecting surface
- Two similar springs P and Q have spring constants Kp and Kq, such that Kp>Kq.
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The current through an inductor changes from 3 A to 2 A is 1 m/s. If induced e.m.f.
- Two spheres of mass m and M are situated in air and the gravitational force
- Which one of the following statements is not correct in case of a semiconductor?
- A radiation of energy ‘E’ falls normally on a perfectly reflecting surface
- Two similar springs P and Q have spring constants Kp and Kq, such that Kp>Kq.
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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