An Electron Is Moving at a Speed of 12 *10⁶

question 28

Multiple Choice

An electron is moving at a speed of 12 *10⁶ m/s at an angle of 30° with respect to a uniform magnetic field of 8.0 * 10^-4 T. What is the radius of the resulting helical path? (m_e = 9.11 * 10^-31 kg, q_e = 1.6 *10^-19 C)

• A) 2.1 cm
• B) 3.7 cm
• C) 4.3 cm
• D) 8.5 cm

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