A vertical wire carries a current in upward direction. An electron beam sent horizontally towards the wire will be deflected (gravity free space) :

towards right

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towards left

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upwards

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downwards

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Solution

The correct option is B upwards
$F = q (\to v \times \to B) = (- e) (- v^i \times (- B^k)) = e v B^j$
Thus, force on the electron beam is along the +ve y-axis.

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A vertical wire carries a current in upward direction. An electron beam sent horizontally towards wire will be deflected.

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