Question

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

Answer 1

Answer:

Here the direction of current toward west and towards north .So by Fleming left hand rule the direction of magnetic field is upward. the rule used in Fleming left hand rule which states that if we stretch our thumb forefinger and middle figure of our left hand perpendicular to each other in such a way that forefinger points the direction of magnetic field and middle figure points the direction of current and middle figure points the direction of current then thumb will represent the direction of force.

So Upward is the correct answer.