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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: - If we study the vibration of a pipe open at both ends
- The threshold frequency for a certain photosensitive metal is ν₀. When it is illuminated
- The kinetic energy of an electron in the first excited state is
- Two spherical conductors A and B of radii 1 mm and 2 mm are separated by a distance
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If we study the vibration of a pipe open at both ends
- The threshold frequency for a certain photosensitive metal is ν₀. When it is illuminated
- The kinetic energy of an electron in the first excited state is
- Two spherical conductors A and B of radii 1 mm and 2 mm are separated by a distance
- The potential energy of particle in a force field is U = A/r² – b/r, where A and B
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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