Question

The figure shows the path of a charged particle moving in a magnetic field directed into the screen. 

 

What is the particle's charge? 

•  neutral 

•  positive 

•  negative

Answer 1

Magnetic fields exert forces on other moving charge. The force a magnetic field exerts on a charge q moving with velocity v is called the Lorentz force.
It is given by F = qv × B.

To find the direction of the force, use the right-hand rule. Let the fingers of your right hand point in the direction of v. Orient the palm of your hand, so that as you curl your fingers, you can sweep them over to point into the direction of B. Your thumb points in the direction of the vector product v × B. If q is positive then this is the direction of F. If q is negative, your thumb points opposite to the direction of F.

So given partcile have negative chagrg