At One Instant an Electron (Charge = -1

question 3

Multiple Choice

At one instant an electron (charge = -1.6 *10^-19C) is moving in the xy plane, the components of its velocity being v_x = 5.0 *10⁵ m/s and v_y = 3.0 * 10⁵ m/s. A magnetic field of 0.80 T is in the positive y direction. At that instant the magnitude of the magnetic force on the electron is:

• A) 0 N
• B) 3.8 * 10^-14 N
• C) 6.4 * 10^-14 N
• D) 7.5 *10^-14 N
• E) 1.0 * 10^-14

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