Question

A negative charge moving with a constant velocity v enters a region of a uniform magnetic field pointing out of the page as shown below. What is the direction of the magnetic force on the charge?

Answer 1

To determine the direction of the magnetic force on a moving charged particle, you can use the right-hand rule for magnetic fields.

Here's how you can apply the right-hand rule in this scenario:

1. Extend your right hand and orient your thumb, index finger, and middle finger perpendicular to each other.

2. Point your index finger in the direction of the magnetic field (out of the page in this case).

3. Point your thumb in the direction of the velocity vector of the negative charge (assuming it is moving to the right).

4. Your middle finger will then indicate the direction of the magnetic force acting on the negative charge.

According to the right-hand rule, the magnetic force on a negative charge moving with a velocity v in a uniform magnetic field pointing out of the page will be directed downward (perpendicular to both the velocity and the magnetic field).