Question

In which direction does a magnetic force act on an electron that is moving in the positive x-direction in a magnetic field pointing in the positive z-direction?

A) any direction in the xy-plane
B) the negative y-direction
c) the negative x-direction
D) the positive y-direction


a particle with charge q is at rest when a magnetic field is suddenly turned on. The field
points in the z-direction. What is the direction of the net force acting on the charged particle?

a) In the z-direction.
b) There is no force on the particle.
c) In the y direction
d) In the x direction

Answer 1

The best answer for the first question is B option ( the negative y-direction) which can be estimated by right hand rule.
And the best option for second question is also B option that there is no force on the particle.