Magnetic Effects & Magnetism

JEE Main level, single correct, medium

214 of 276

Question 214 of 276

A charge QQ is moving dl⃗d\vec{l} distance in the magnetic field B⃗\vec{B}. Find the value of work done by B⃗\vec{B}.

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Answer: (C) Zero

Since force on a point charge by magnetic field is always perpendicular to v⃗[F⃗=q(v⃗×B⃗)]\vec{v}\left[\vec{F}=q\left(\vec{v}\times \vec{B}\right)\right]
∴∴ Work by magnetic force on the point charge is zero.

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