Physics - EMI/AC Question with Solution | TestHub

PhysicsEMI/ACMotional & Rotational EMFEasy2 minPYQ_2020

PhysicsEasysingle choice

A conducting rod of resistance $r$ moves uniformly with a constant speed $v$ in a uniform magnetic field. If the rod keeps moving uniformly, then the amount of force required is

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Answer:

Solution:

$\vec{F} = i \int \vec{d l} \times \vec{B}$

$\Rightarrow F = i l B$

$i = \frac{e_{i n}}{(R + r)}$

When conducting rod moves in crossed magnetic field constant velocity $v$ , emf is induced $= B v l$

$\Rightarrow i = \frac{B v l}{R + r}$

$∴ F$ $= \frac{v B l}{(R + r)} l B$

$= \frac{v B^{2} l^{2}}{(R + r)}$

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

⏱ 2mℹ️ Source: PYQ_2020

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