An Electron Moving Perpendicular to a Uniform Magnetic Field of 3.2

question 34

Multiple Choice

An electron moving perpendicular to a uniform magnetic field of 3.2 × 10^-2 T moves in a circle of radius 0.40 cm.How fast is this electron moving? (e = 1.60 × 10^-19 C,m_electron = 9.11 × 10^-31kg)

• A)2.2 × 10⁷ m/s
• B)1.9 × 10⁷ m/s
• C)1.9 × 10⁶ m/s
• D)3.0 × 10⁷ m/s
• E)0.80 × 10⁷ m/s

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