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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: - Energy stored in the coil of a self inductance 40 mH carrying a steady current of 2A
- Two beams of light having intensities I and 4I interfere to produce a fringe pattern
- The kirchoff’s first law (∑i=0) and second law (∑iR=∑E), where the symbols
- A point performs simple harmonic oscillation of period T and the equation of motion
- If the kinetic energy of the particle is increased to 16 times its previous value
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Energy stored in the coil of a self inductance 40 mH carrying a steady current of 2A
- Two beams of light having intensities I and 4I interfere to produce a fringe pattern
- The kirchoff’s first law (∑i=0) and second law (∑iR=∑E), where the symbols
- A point performs simple harmonic oscillation of period T and the equation of motion
- If the kinetic energy of the particle is increased to 16 times its previous value
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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