Question

A charged particle is moving parallel to a uniform magnetic field. Then the force on the charged particle is

• A. \[ qvB \]
• B. \[ \frac{B}{qv} \]
• C. \[ \frac{v^2B}{q} \]
• D. Zero

Hint:

Magnetic force is maximum when \[ \theta=90^\circ, \] for which \[ F=qvB. \] If the particle moves parallel or antiparallel to the magnetic field, \[ \theta=0^\circ \text{ or }180^\circ, \] and hence \[ F=0. \]

Answer 1

The Correct Option is D