Question

A proton is moving along Z-axis in a magnetic field. The magnetic field is along X-axis. The proton will experience a force along

• A. X-axis
• B. Y-axis
• C. Z-axis
• D. Negative Z-axis

Answer 1

Answer: (B)

Y-axis

Answer 2

This is according to the cross product $\vec { F } = q ( \vec { v } \times \vec { B } )$ otherwise can be evaluated by the left-hand rule of Fleming.