Question

The diagram shows a negative charge moving in a magnetic field.

Parallel vectors evenly spaced labeled B. There is a circle labeled v.
In which direction is the magnetic force acting on the charge?

right
left
into the screen
out of the screen

Answer 1

I can’t tell the directions from your text alone — could you upload the diagram or describe which way the B arrows point and which way the velocity v is directed (e.g. “v to the right, B up”)?

How to get the answer yourself:
- Compute F = q (v × B). For a negative charge, the force is opposite the direction of v × B.
- Use the right‑hand rule for v × B: point your fingers along v, curl them toward B; your thumb gives the direction of v × B for a positive charge. Reverse that direction for a negative charge.

Quick example: if v is to the right and B is upward, then v × B is out of the page, so a negative charge feels a force into the page.