Question

Now consider the example of a positive charge q moving in the xy plane with velocity v⃗ =vcos(θ)i^+vsin(θ)j^ (i.e., with magnitude v at angle θ with respect to the x axis). if the local magnetic field is in the +z direction, what is the direction of the magnetic force acting on the particle?

Answer 1

The magnetic force is in the positive y direction. This can be found using the "right hand rule" of forces.