Question:
A charged particle moves perpendicular to a magnetic field. Then
A charged particle moves perpendicular to a magnetic field. Then
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Magnetic force changes direction, not speed:
vecF = qvecv × vecB
Updated On: Mar 20, 2026
- kinetic energy changes but the momentum is constant
- the momentum changes but the kinetic energy is constant
- both momentum and kinetic energy of the particle are not constant
- both momentum and kinetic energy of the particle are constant
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The Correct Option is B
Solution and Explanation
Step 1: Magnetic force is always perpendicular to velocity.
Step 2: Work done by magnetic force is zero.
Step 3: Hence speed and kinetic energy remain constant, but direction of momentum changes.
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