Question

A charged particle moves in a clockwise direction in a magnetic field

Answer 1

A charged particle moves in a clockwise direction in a Magnetic Field which is perpendicular to the plane of paper directed downwards.

Answer 2

Answer:

For any charge,the direction anti lockwise or clockwise is given by Flemings left hand rule:

Position your left hand like this,

The thumb represents the force acting or direction of deflection.

The fore finger represents the direction of magnetic field.

The central finger represents the direction of propagation of the charge.

But here you must remember the exception for negative charges(electrons) that the final force direction should be taken the opposite of what Flemings rule states.

So actually it should be revolving in anticlockwise direction applying the left hand rule at that instant. But it is revolving in completely opposite, the clockwise direction, so it is a negative charge.

Remember that Force acting on that charged particle is given by,

F=q ( v × B ) so it is just a cross product. Therefore the left hand rule is just based on the concept of cross product or the x,y,z axes.

In short that left hand position indicates the three axes:

Thumb=z

Fore finger =y

Central finger=x

So In competitive exams if you forget how to take the three axes or given the x, y axes, if you get confused,in which direction should you take the z, inside the paper or outside the paper;use the left hand rule.