Question

When does a moving charge experience maximum magnetic force?

Options

• When motion is perpendicular to the field at \[90^\circ\]

• When the particle is at rest

• When motion is parallel to the field at \[180^\circ\]

• When motion is parallel to the field at \[0^\circ\]

Answer 1

At \[90^\circ\], \[\sin\theta=1\], so the magnetic force has magnitude \[F=qvB\] for a positive charge. This is the maximum force for fixed charge, speed, and field strength.