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. Spectrum of X-rays is
2. A step-down transformer has 50 turns on secondary and 1000 turns on primary winding.
3. In an ammeter, 0.2% of main current passes through the galvanometer
4. A wave in a string has an amplitude of 2cm. The wave travels in the positive direction
5. The half-life of radioactive element is 600 yr. The fraction of sample

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