Question

an electron enter a uniform magnetic field at right angles.in which direction will this electron move? state the rule applied by you in finding the direction of motion of the electron.

Answer 1

The rule applied here if RIGHT HAND FLEMING'S RULE

Index finger: Magnetic field

Thumb: motion

Middle finger: current direction

From this rule mag filed(B) , current and motion should be in perpendicular to each other, other wise there will be any magnetic acting.

Therefore, in order to have mag field the electron should move perpendicular/right angle to the given magnetic field.

If it is parallel then there won't be any magnetic field acting.