Induced Emf Motion Hard

Hardphysics

Rod length ℓ moving perpendicular to B with speed v. Induced EMF is:

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B ℓ v

B v / ℓ

B / (v ℓ)

$B^{2} ℓ v$

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Subject: physics
Chapter: electromagnetic induction and ac
Topic: induced emf motion hard
Difficulty: Hard
Year: 2025

Solution

Correct Answer:

B ℓ v

This is called Motional EMF.

When a rod of length $l$ moves at speed $v$ inside a uniform magnetic field $B$ , the Lorentz force ( $F = q v B$ ) pushes charges to opposite ends of the rod.
This separation of charge creates a potential difference.
The induced EMF magnitude is: $E = Bl v sin θ$ where $θ$ is the angle between $v$ and $B$ . For perpendicular motion, $sin 9 0^{\circ} = 1$ .

This hard difficulty physics question is from the chapter electromagnetic induction and ac, covering the topic of induced emf motion hard. It appeared in the 2025 exam.

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Induced Emf Motion Hard

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