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A charged particle moves through a magnetic field in a direction perpendicular to it. Then the

1. velocity remains unchanged
2. speed of the particle remains unchanged
3. direction of the particle remains unchanged
4. acceleration remains unchanged

Correct answer: speed of the particle remains unchanged

Solution

When a charged particle moves perpendicular to a magnetic field, it experiences a magnetic force that changes its direction but not its speed, as the force is always perpendicular to the velocity. Thus, the speed remains unchanged.

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