M Prep | MCAT 2015 Question of the Day - Prep, Practice Questions, and More!

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