A solid metal cube of edge length \( 2 \mathrm{~cm} \) is moving in a positive \( y \) direction...

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A solid metal cube of edge length \( 2 \mathrm{~cm} \) is moving in a positive \( y \) direction at a constant speed of \( 6 \mathrm{~m} / \mathrm{s} \)
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There is a uniform magnetic field of \( 0.1 \mathrm{~T} \) in the
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positive \( z \)-direction. The potential difference between the two faces of the cube perpendicular to the \( x \)-axis, is
(1) \( 6 \mathrm{mV} \)
(2) \( 1 \mathrm{mV} \)
(3) \( 12 \mathrm{mV} \)
(4) \( 2 \mathrm{mV} \)
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