A charged particle is observed traveling in a circular path of radius R in a uniform magnetic field.If the particle were traveling twice as fast,the radius of the circular path would be
A)2R.
B)4R.
C)8R.
D)R/2.
E)R/4.

Question

Quizplus · Accepted Answer

The radius of the circular path of a charged particle in a magnetic field is directly proportional to the velocity of the particle. Therefore, if the velocity doubles, the radius of the path also doubles.

A Charged Particle Is Observed Traveling in a Circular Path