A wire of length \( l \) is moved with a constant velocity \( \vec{v} \) in a magnetic field. A ...

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A wire of length \( l \) is moved with a constant velocity \( \vec{v} \) in a magnetic field. A potential difference appears across the two ends
(a) If \( \vec{v} \| \vec{l} \)
(b) If \( \vec{v} \| \vec{B} \)
(c) If \( \vec{l} \| \vec{B} \)
(d) None of these
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