An electron moving horizontally to the right with speed v enters a region where a uniform magnetic field exists pointing into the page with magnitude b. as a result the electron executes uniform circular motion with radius r. what is the total work done by the magnetic field during half cycle of the electron's motion in the field? a br/ e b -br / e c. 2pirebv d 2pir / ebv e 0
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will yield a vector perpendicular to both magnetic field and velocity vector .
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