A positively charged particle (alpha particle),

Question.
A positively charged particle (alpha particle), projected towards west, is deflected towards north by a magnetic field. The direction of magnetic field is

(1) towards south

(2) towards east

(3) downward

(4) upward

solution:
A positively charged particle (alpha particle), projected towards west, is deflected towards north by a magnetic field. The direction of magnetic field is

By applying Fleming’s left hand rule, we find that the magnetic field is in upward direction. Thus, option

(4) is correct.

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