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Moving Charges and Magnetism
Motion of Charge in Magnetic Field
1 question from 1 paper, each with its answer.
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- paper
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Concepts tested
- Magnetic force does no work
All Questions
2003 AIPMT 1 question
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A charged particle moves through a magnetic field in a direction perpendicular to it. Then theMagnetic force on a moving charge: $\vec{F} = q(\vec{v} \times \vec{B})$. This force is always perpendicular to the velocity $\vec{v}$.
A force perpendicular to the velocity does no work, so the kinetic energy and hence the speed of the particle remain constant.
The force continuously changes the direction of motion, so the particle moves in a circle. Its velocity (a vector) and its acceleration (directed towards the centre, changing in direction) both change.
So the speed of the particle remains unchanged.