An electron traveling toward the 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 45° below horizontal
What is the magnitude of the force that the Earth's magnetic field exerts on the electron? (e = 1.60 × 10-19 C)
A) 2.3 × 10-18 N
B) 3.2 × 10-18 N
C) 2.3 × 10-19 N
D) 3.2 × 10-19 N
E) 2.3 × 10-20 N
Answer: A
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