What is the direction of force on a proton moving in a magnetic field?

Subject: General Science

Topic: Magnetic Effects of Electric Current

Options:

1. Option A: Always in the direction of motion
2. Option B: Perpendicular to both velocity and magnetic field
3. Option C: Always opposite to the direction of motion
4. Option D: In the direction of the magnetic field

Correct Answer:

Option B: Perpendicular to both velocity and magnetic field

Explanation:

The force on a charged particle moving in a magnetic field is perpendicular to both the velocity (direction of motion) and the magnetic field. This is given by Fleming's left-hand rule.