Question

A positively charged particle projected towards west is deflected towards north by a magnetic field the direction of magnetic field is​

Answer 1

$\huge\mathcal\blue{Upward \: direction}$

Explanation:

The positively charged particle is moving towards West that is, 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 towards North.

Thus Fleming's left hand rule , the direction of magnetic field is in upward direction.