Question

A positively-charged particle (alpha-particle) projected to
deflected towards north by a magnetic field. The direction of
field is
(a) towards south (b) towards east
(c) downward
(d) upward.​

Answer 1

Explanation:

A positively charged particle( Alpha particle) projected towards north by magnetic field the direction of the field is Upward.

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Answer 2

$\bf\huge\underline{Answer}$

(d) Upward

$\bf\huge\underline{Explaination}$

The positive charged particle is moving toward west i.e., the direction of current is towards west (current flows in the direction of the motion of positive charge). The particle is deflected towards north so, the direction of force is toward north. So, from Fleming's left hand the direction of force obtained will be upward.