An Electron Traveling Due North with Speed 4

question 74

Multiple Choice

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 45° below horizontal. What force acts on the electron?

• 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

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