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Q.
A charged particle moves through a magnetic field in a direction perpendicular to it. Then the
BHUBHU 2007Moving Charges and Magnetism
Solution:
If a moving charged particle is subjected to a perpendicular uniform magnetic field, then according to $F=q v B \sin \theta$, it will experience a maximum force which will provide the centripetal force to particle and it will describe a circular path with uniform speed.