Question:
A charge $Q$ is moving $\overrightarrow{\mathrm{dI}}$ distance in the magnetic field $\overrightarrow{\mathrm{B}}$. Find the value
of work done by $\overrightarrow{\mathrm{B}}$.
Correct Option: , 3
Solution:
(3)
Since force on a point charge by magnetic field is always perpendicular to
$\vec{v}[\vec{F}=q \vec{V} \times \vec{B}] \therefore$ Work by magnetic force on the point charge is zero.