Magnetic force on moving charge:
An electron traveling toward the north with speed 4.0x105 m/s enters a region where the Earth’s magnetic field has the magnitude 5x10-5 T and is directed downward at 45° below horizontal. What is the magnitude of the force that the Earth’s magnetic field exerts on the electron? (e=1.60x10-19 C)
A) 2.3x10-20 N
B) 2.3x10-19 N
C) 3.2x10-19 N
D) 2.3x10-18 N
E) 3.2x10-18 N
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