Question

A charge is moving in a magnetic field that points to the left.

What direction can the charge move and experience no magnetic force? Check all that apply.

up
down
left
right
into the screen
out of the screen

Answer 1

Magnetic force is F = q(v × B). That is zero whenever v is parallel or antiparallel to B (or v = 0).

Since B points left, a charge moving left or right has v parallel/antiparallel to B and experiences no magnetic force.

So check: left and right.