A charge Q is moving d l → distance in the magnetic field B → . Find the value of work done by B → .

Since force on a point charge by magnetic field is always perpendicular to v → F → = q v → × B → ∴ Work by magnetic force on the point charge is zero.

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PhysicsMagnetismMagnetic torque & energyEasy2 minPYQ_2021

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A charge $Q$ is moving $d \vec{l}$ distance in the magnetic field $\vec{B}$ . Find the value of work done by $\vec{B}$ .

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Answer:

Solution:

Since force on a point charge by magnetic field is always perpendicular to $\vec{v} [\vec{F} = q (\vec{v} \times \vec{B})]$

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

Stream:JEESubject:PhysicsTopic:MagnetismSubtopic:Magnetic torque & energy

⏱ 2mℹ️ Source: PYQ_2021

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