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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: - As a light wave travels from one medium to another which of its following properties
- The electron drift speed is small and the change of the electron is also small
- If the pressure of gas is increased from 1.01×10⁵ Pa to 1.165×10⁵ Pa and volume
- Photoelectric emision occurs only when the incident light has more than a certain minimum
- If vₑ is escape velocity and vₙ is orbital velocity of a satellite
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- As a light wave travels from one medium to another which of its following properties
- The electron drift speed is small and the change of the electron is also small
- If the pressure of gas is increased from 1.01×10⁵ Pa to 1.165×10⁵ Pa and volume
- Photoelectric emision occurs only when the incident light has more than a certain minimum
- If vₑ is escape velocity and vₙ is orbital velocity of a satellite
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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