Cathode rays enter into a uniform magnetic fi | vedclass

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(B) When a charged particle (like an electron in a cathode ray) enters a uniform magnetic field $B$ with a velocity $v$ perpendicular to the field,the

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Circle

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(B) When a charged particle (like an electron in a cathode ray) enters a uniform magnetic field $B$ with a velocity $v$ perpendicular to the field,the magnetic Lorentz force $F = q(v 	imes B)$ acts as a centripetal force.Since the force is always perpendicular to the velocity,the speed of the particle remains constant,but the direction changes continuously.This results in the particle tracing a circular path.Therefore,the correct option is $B$.

Cathode rays enter into a uniform magnetic field perpendicular to the direction of the field. In the magnetic field,their path will be:

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