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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 an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits
- When a charged oil drop moves upwards in an electric field,
- The maximum and minimum magnitudes of the resultant of two vectors
- Which of the following pairs is wrong
- What is the Q-value of the reaction?
¹H+⁷Li→⁴He+⁴He
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits
- When a charged oil drop moves upwards in an electric field,
- The maximum and minimum magnitudes of the resultant of two vectors
- Which of the following pairs is wrong
- What is the Q-value of the reaction? ¹H+⁷Li→⁴He+⁴He
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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