JEE PYQ: Magnetic Effects Of Current Question 1
Question 1 - 2021 (16 Mar 2021 Shift 2)
A charge $Q$ is moving $\vec{dl}$ distance in the magnetic field $\vec{B}$. Find the value of work done by $\vec{B}$.
(1) $1$
(2) Infinite
(3) Zero
(4) $-1$
Show Answer
Answer: (3) Zero
Solution
Since force on a point charge by magnetic field is always perpendicular to velocity $[\vec{F} = q\vec{v} \times \vec{B}]$, work done by magnetic force on the point charge is zero.
BETA
