Question

A positiveiy charged particle (alpha particles) projected towards west is deflected towards north by magnetic field. state the direction of magnetic field.

Answer 1

Since a positively charged particle (alpha particles) is projected towards west,so the direction of current is towards west.Now it is deflected towards north by magnetic field it means force is towards north.

Now hold the forefinger,center finger and thumb of our left hand at right angles to one another.Let us adjust the hand in such a way that our center finger points towards west and thumb points towards north.We see that, our forefinger will be pointing upward.This is the direction of magnetic field.