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?

Aany direction in the xy-plane

Bthe negative y-direction

Cthe negative x-direction

Dthe 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?

AIn the z-direction.

BThere is no force on the particle.

CIn the y direction

DIn the x direction