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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: - A plane electromagnetic wave of frequency 20 MHz travels through a space along
- If the rise in height of capillary of two tubes is 6.6 cm and 2.2 cm
- The velocity v of waves produced in water depends on their wavelength λ, the density
- A man weighing 60 kg climbs a staircase carrying a 20 kg load on his hand
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A plane electromagnetic wave of frequency 20 MHz travels through a space along
- If the rise in height of capillary of two tubes is 6.6 cm and 2.2 cm
- The velocity v of waves produced in water depends on their wavelength λ, the density
- A man weighing 60 kg climbs a staircase carrying a 20 kg load on his hand
- A shell of mass 200 g is ejected from a gun of mass 4 kg by an explosion
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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