Electron Motion in Magnetic Field · PhysicsBowl 2011 #29

Physics · electromagnetism

Problem

An electron moves with speed

1.00\times 10^{3}

m/s as it enters a region of space that has only a uniform magnetic field. The electron is accelerated because of this field with a constant magnitude of

a = 8.00\times 10^{2}

m/s² for the entire time of

1.00\times 10^{-3}

s that it is in the field. With what speed would the electron exit the field? Ignore gravity. (A)

1.80\times 10^{3}

m/s (B)

1.41\times 10^{3}

m/s (C)

1.00\times 10^{3}

m/s (D)

2.00\times 10^{1}

m/s (E) It depends on the initial angle of the electron's velocity with respect to the magnetic field.

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