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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 the minimum energy of photons needed to produce photoelectrons is 3 eV,
- The ratio of the weight of a man in a stationary lift and when it is moving downwards
- A bomb of mass 30 kg at rest exploded into two pieces of masses 18 kg
- Planck’s constant has same dimensions as those of
- A parallel plate condenser has a uniform electric field E(V/m) in the space between
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If the minimum energy of photons needed to produce photoelectrons is 3 eV,
- The ratio of the weight of a man in a stationary lift and when it is moving downwards
- A bomb of mass 30 kg at rest exploded into two pieces of masses 18 kg
- Planck’s constant has same dimensions as those of
- A parallel plate condenser has a uniform electric field E(V/m) in the space between
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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