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Physics - EMI/AC Question with Solution | TestHub

PhysicsEMI/ACMotional & Rotational EMFMedium2 minQB

PhysicsMediumsingle choice

A wooden stick of length $3 ℓ$ is rotated about an end with constant angular velocity $ω$ in a uniform magnetic field B perpendicular to the plane of motion. If upper one third of it's length is coated with copper then induced emf in part of copper coating of the stick is

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Answer:

Solution:

Motional emf

$e = \frac{B ω ( x _{2}^{2} - x _{1}^{2} )}{2}$

$= \frac{B ω [ ( 3 ℓ ) ^{2} - ( 2 ℓ ) ^{2} ]}{2}$

$= \frac{5 B ω ℓ ^{2}}{2}$

Stream:JEESubject:PhysicsTopic:EMI/ACSubtopic:Motional & Rotational EMF

⏱ 2mℹ️ Source: QB

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