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  4. A solid metal cube of edge length 2 cm is moving in the positive y -direction at a constant speed of 6 m s- 1 . There is a uniform magnetic field of text0.1 T in the positive z -direction. The potential difference between the two faces of the cube perpendicular to the x -axis is

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Q. A solid metal cube of edge length $2 \, cm$ is moving in the positive $y$ -direction at a constant speed of $6 \, m \, s^{- 1}$ . There is a uniform magnetic field of $\text{0.1} \, T$ in the positive $z$ -direction. The potential difference between the two faces of the cube perpendicular to the $x$ -axis is

NTA AbhyasNTA Abhyas 2020

Solution:

$e=Bvl=\text{0.1}\left(2 \times \left(10\right)^{- 2}\right)\times 6=12\times \left(10\right)^{- 3}=12mV$