A charge $Q$ is moving $\overrightarrow{dl}$ distance in the magnetic field $\overrightarrow{ B }$. Find the value of work done by $\overrightarrow{ B }$.
JEE MAIN 2021, Medium
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Since force on a point charge by magnetic field is always perpendicular to $\overrightarrow{ v }[\overrightarrow{ F }= q \overrightarrow{ V } \times \overrightarrow{ B }]$
$\therefore$ Work by magnetic force on the point charge is zero.
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