An electron passes through two rectangular regions that contain uniform magnetic

Question

An electron passes through two rectangular regions that contain uniform magnetic fields, B1 and B2. The field B1 is stronger than the field B2. Each field fills the region completely. How does the speed v1 of the electron in region 1 compare with the speed v2 in region 2? http://tinypic.com/r/w2hv21/6 The speeds are the same in both regions. Correct. The magnetic force that acts on the electron in regions 1 and 2 is always perpendicular to its path, so the force does no work. According to the work energy theorem, the kinetic energy, and hence speed, of the electron does not change when no work is done. ***I would like someone to explain this to me. I can't seem to understand the concept. Thank you.

Explanation / Answer

Work= F*d cos(angle). If you put in the angle of 90 you get 0. Therefore, no work is being done. I am not sure about the other question. You might want to look in to Lorentz relation.

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