| ⇦ | 
| ⇨ |
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: - If a magnet is suspended at an angle 30⁰ to the magnetic meridian, the dip needle
- A spring balance is attched to the ceiling of lift.A man hangs his bag on the string
- A force of 10 newton acts on a body of mass 20 kg for 10 seconds. Change in its momentum
- If longitudinal strain for a wire is 0.03 and its poisson’s ratio is 0.5
- When the temperature increases, the viscocity of
Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If a magnet is suspended at an angle 30⁰ to the magnetic meridian, the dip needle
- A spring balance is attched to the ceiling of lift.A man hangs his bag on the string
- A force of 10 newton acts on a body of mass 20 kg for 10 seconds. Change in its momentum
- If longitudinal strain for a wire is 0.03 and its poisson’s ratio is 0.5
- When the temperature increases, the viscocity of
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