An Electron Traveling Toward the North with Speed 4

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^-19C)

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

Correct Answer:

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