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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: - Across a metallic conductor of non-uniform cross-section, a constant potential
- Which of the following statement about scalar quantity is true?
- An electron in hydrogen atom makes a transition n₁ → n₂
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Across a metallic conductor of non-uniform cross-section, a constant potential
- Which of the following statement about scalar quantity is true?
- An electron in hydrogen atom makes a transition n₁ → n₂
- The speed of an electron having a wavelength of 10⁻¹⁰ m is
- Aperture of human eye is 0.2 cm. The minimum magnifying power of a visual
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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