Question

A charged particle enters a uniform magnetic field with a certain speed at right angles to it. In the magnetic field a change could occur in its

• A. kinetic energy
• B. angular momentum
• C. linear momentum
• D. speed

Answer 1

Answer: (C)

linear momentum

Answer 2

Force acting on particle due to magnetic field $B$ is
$F=q \vec{v} \times \vec{B}$...(i)
and centripetal force is $F=\frac{m v^{2}}{r}$...(ii)
From Eqs. (i) and (ii), we get
$B=\frac{m v}{r q}=\frac{\text { linear momentum }}{\text { charge }}$