A conducting rod of length \( l \) is falling with a constant velocity \( v \) perpendicular to ...

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A conducting rod of length \( l \) is falling with a constant velocity \( v \) perpendicular to a uniform
\( \mathrm{P} \)
horizontal magnetic field \( B \). The potential difference
W
between its two ends will be
(1) \( 2 B l v \)
(2) \( B l v \)
(3) \( \frac{1}{2} B l v \)
(4) \( B^{2} r^{2} v^{2} \)
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