A disc of radius 0.1 m is rotating with a frequency 10 rev/sec in a normal magnetic

⇦

⇨

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

Related Questions:

1. A rocket with a lift-off mass 3.5 x 10⁴ kg is blasted upwards with an initial acceleration
2. The velocity of a particle performing simple harmonic motion, when it passes
3. In common base mode of a transistor, the collector current is 5.488 mA
4. The moment of inertia of a semicircular ring about the centre is
5. A simple pendulum performs simple harmonic motion about x = 0 with an amplitude

Topics: Magnetic Effects of Current and Magnetism (167)
Subject: Physics (2479)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends