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  4. A conducting rod AB of length l=1 m is moving at a velocity v=4 m s- 1 making an angle of 30° with its length. A uniform magnetic field B=2 T exists in a direction perpendicular to the plane of motion, then <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-3jb6dxr4v445.png />

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Q. A conducting rod AB of length $l=1 \, m$ is moving at a velocity $v=4 \, m \, s^{- 1}$ making an angle of 30° with its length. A uniform magnetic field $B=2 \, T$ exists in a direction perpendicular to the plane of motion, then

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NTA AbhyasNTA Abhyas 2020

Solution:

$e=B\left(v \, s i n \left(30\right)^{o}\right)l=4 \, volt$
Fleming right hand $I_{i n d}$ B to A
$\Rightarrow V_{A}-V_{B}=4 \, volt$