Question:
A copper disc of radius 0.1 m rotates about an axis passing through its center and perpendicular to its plane with 10 revolutions per second in a uniform transverse magnetic field of 0.1 T. The emf induced across the radius of the disc is:
A copper disc of radius 0.1 m rotates about an axis passing through its center and perpendicular to its plane with 10 revolutions per second in a uniform transverse magnetic field of 0.1 T. The emf induced across the radius of the disc is:
Updated On: Mar 11, 2025
π/10 V
2π/10 V
10 π mV
20 π mV
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The Correct Option is C
Solution and Explanation
The correct option is: (C): 10 π mV.
The electromotive force (emf) induced between the center and rim of a rotating disc can be expressed as:
E = 1/2 * B * ω * R^2
Substituting the given values:
E = 1/2 * 0.1 * 2π * 10 * (0.1)^2
E = 10π * 10^-3 volt
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Concepts Used:
Electromagnetic Induction
Electromagnetic Induction is a current produced by the voltage production due to a changing magnetic field. This happens in one of the two conditions:-
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Formula:
The electromagnetic induction is mathematically represented as:-
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