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Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency f Hz. The magnitude of magnetic induction at the centre of the ring is
Options
(a) µ₀q f / 2 R
(b) µ₀q / 2 f R
(c) µ₀q / 2π f R
(d) µ₀q f / 2π R
Correct Answer:
µ₀q f / 2 R
Explanation:
When the ring rotates f Hz, the current flowing in the ring is i = q/T = qf
Magnetic field at the centre of the ring is
B = µ₀I / 2 R = µ₀q f / 2 R
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- An electron in potentiometer experiences a force 2.4×10⁻¹⁹N. The length of potentiometer
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Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When the rate of flow of charge through a metallic conductor
- An electron in potentiometer experiences a force 2.4×10⁻¹⁹N. The length of potentiometer
- The resistance in the two arms of the meter bridge are 5Ω and RΩ, respectively
- From a disc of radius R, a concentric circular portion of radius r is cut-out so
- An object is attached to the bottom of a light vertical spring and set vibrating.
Topics: Magnetic Effects of Current and Magnetism (167)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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