| ⇦ | 
| ⇨ |
A thin ring of radius R meter has charge q coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of f revolutions/s. The value of magnetic induction in Wb/m² at the centre of the ring is
Options
(a) µ₀q f / 2π R
(b) µ₀q / 2π f R
(c) µ₀q / 2 f R
(d) µ₀q f / 2 R
Correct Answer:
µ₀q f / 2 R
Explanation:
Current in the ring due to the rotation,
I = q/T = q? / 2π = q.2π f / 2π
Therefore, magnetic field at the centre of the ring is
B = µ₀I / 2R = µ₀/2R . q2π f / 2π
= µ₀q f / 2 R
Related Questions: - The electromagnetic theory of light failed to explain
- A series combination of resistor (R), capacitor (C), is connected to an AC source
- A point charge q is situated at a distance r on axis from one end of a thin
- Two bodies A and B having temperature 327° C and 427° C are radiating heat
- The radius of gyration of a solid sphere of radius r about a certain axis is r
Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The electromagnetic theory of light failed to explain
- A series combination of resistor (R), capacitor (C), is connected to an AC source
- A point charge q is situated at a distance r on axis from one end of a thin
- Two bodies A and B having temperature 327° C and 427° C are radiating heat
- The radius of gyration of a solid sphere of radius r about a certain axis is r
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
Leave a Reply