Q: An electron moving with a velocity of 500 m/s in the x-direction enters a region filled with a constant magnetic field (B), which has a magnitude of 0.25 teslas and points into the page. The constant field region is 5 m long and 4 m wide and the electron enters 0.5 m from the top of the region. What is the magnitude of the electron's velocity when it leaves the region?
A		125 m/s
B		250 m/s
C		500 m/s
D		1,000 m/s

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