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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: - Bragg’s law for X-rays is
- Which of the following phenomena does not show the wavenature of light?
- A resistor 30Ω, inductor of reactance 10 Ω and capacitor of reactance 10 Ω
- At place on earth, the vertical component of earth’s magnetic field is √3 times
- A tuning fork vibrates with 2 beats in 0.04 second. The frequency of the fork is
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Bragg’s law for X-rays is
- Which of the following phenomena does not show the wavenature of light?
- A resistor 30Ω, inductor of reactance 10 Ω and capacitor of reactance 10 Ω
- At place on earth, the vertical component of earth’s magnetic field is √3 times
- A tuning fork vibrates with 2 beats in 0.04 second. The frequency of the fork is
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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