if a charged particle is moving in a uniform magnetic field, its path can be circular.
The magnetic field is the region of the space where the charged particle experiences the magnetic force. The magnetic field is uniform, when it does not change with time.
From the Fleming's left hand rule shows that the magnetic force is perpendicular to the motion of a charged particle. It follows a curved path in a uniform magnetic field. The particle will continue to follow this curved path until and unless it completes a circle.
Thus, if a charged particle is moving in a uniform magnetic field, its path can be circular.
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