An Electron Moving Perpendicular to a Uniform Magnetic Field of 3.2

question 1116

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? (m_el = 9.11 × 10^-31 kg.e = 1.60 × 10^-19C)

• A) 2.2 × 10⁷ m/s
• B) 1.9 × 10^-2 m/s
• C) 1.9 × 10^-30 m/s
• D) 3.0 × 10⁶ m/s

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