An electron traveling at high (or relativistic) speed moves perpendicularly to a magnetic field of 0.20 T.

Question:

An electron traveling at high (or relativistic) speed moves perpendicularly to a magnetic field of 0.20 T. Its path is circular, with a radius of 15 m. Find 

(a) The momentum, 

(b) The speed, and 

(c) The kinetic energy of the electron. 

Recall that, in nonrelativistic situ ations, the magnetic force qυB furnishes the centripetal force mu2 / r. Thus, since p = mυ, it follows that

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