| ⇦ | 
| ⇨ |
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: - In intrinsic semiconductor at room temperature number of electrons and holes are
- The flux linked with a circuit is given by φ=t³+3t-7. The graph between time
- The power obtained in a reactor using U²³⁵ disintegration is 1000 kW
- A body of mass (4m) is lying in x-y plane at rest. It suddenly explodes into three
- If oxygen has root mean square velocity of C m/s, then root mean square velocity of H
Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In intrinsic semiconductor at room temperature number of electrons and holes are
- The flux linked with a circuit is given by φ=t³+3t-7. The graph between time
- The power obtained in a reactor using U²³⁵ disintegration is 1000 kW
- A body of mass (4m) is lying in x-y plane at rest. It suddenly explodes into three
- If oxygen has root mean square velocity of C m/s, then root mean square velocity of H
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