An electron traveling due north with speed 4.0 ˛ 105 m/s enters a region where the Earth's magnetic field has the magnitude 5.0 ˛ 10-5 T and is directed downward at 45e below horizontal. What force acts on the electron?

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An electron traveling due north with speed 4.0 ˛ 105 m/s enters a region where the Earth's magnetic field has the magnitude 5.0 ˛ 10-5 T and is directed downward at 45e below horizontal. What force acts on the electron?