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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: - Wires A and B are made from the same material. A has twice the diameter and three times
- A tangent galvanometer has a coil of 50 turns and a radius of 20 cm. The horizontal
- When a magnet is taken towards a coil, the induced e.m.f. depends on
- When the angle of incidence is 60° on the surface of a glass slab, it is found
- The mean free path of molecules of a gas,(radius ‘r’) is inversely proportional to
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Wires A and B are made from the same material. A has twice the diameter and three times
- A tangent galvanometer has a coil of 50 turns and a radius of 20 cm. The horizontal
- When a magnet is taken towards a coil, the induced e.m.f. depends on
- When the angle of incidence is 60° on the surface of a glass slab, it is found
- The mean free path of molecules of a gas,(radius ‘r’) is inversely proportional to
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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