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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
- Two thin dielectric slabs of dielectric constants K₁ and K₂, (K₁ < K₂) are inserted
- A battery of e.m.f. E and internal resistance r is connected to an external resistance
- In intrinsic semiconductor at room temperature number of electrons and holes are
- A remote-sensing satellite of earth revolves in a circular orbit at a height
- Two conducting spheres of radii 5 cm and 10 cm are given a charge of 15 μC each.
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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