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A disc of radius 0.1 m is rotating with a frequency 10 rev/sec in a normal magnetic field of strength 0.1 tesla. Net induced emf is
Options
(a) 2 π x 10⁻² V
(b) 4 π x 10⁻² V
(c) π x 10⁻² V
(d) 3 π x 10⁻² V
Correct Answer:
π x 10⁻² V
Explanation:
Induced emf = Baʋ
= 0.1 × π (0.1)² × 10
= 0.1 × 0.1π × 10
= π × 10⁻³ × 10
= π × 10⁻² V
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Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Reactance of a capacitor of capacitance C µF for A.C freqency (400 / π) Hz is 25 ohm
- A sound absorber attenuates the sound level by 20 dB. The intensity decreases
- If a wire is stretched to four times its length, then the specific resistance
- The wavelength of kα, X-rays produced by an X-ray tube 0.76Å. The atomic number
- A body oscillates with amplitude of 10 cm in a horizontal platform.
Topics: Magnetic Effects of Current and Magnetism (167)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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