A charge Q is moving


A charge $Q$ is moving $\overline{\mathrm{dI}}$ distance in the magnetic field $\overrightarrow{\mathrm{B}}$. Find the value of work done by $\overrightarrow{\mathrm{B}}$.

  1. 1

  2. Infinite

  3. Zero

  4. $-1$

Correct Option: , 3


Since force on a point charge by magnetic field

is always perpendicular to $\overrightarrow{\mathrm{V}}[\overrightarrow{\mathrm{F}}=\mathrm{q} \overrightarrow{\mathrm{V}} \times \overrightarrow{\mathrm{B}}]$

$\therefore$ Work by magnetic force on the point charge is zero.


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