At One Instant an Electron (Charge = -1

question 45

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 *10⁵ m/s and v_y = 3 *10⁵ m/s. A magnetic field of 0.8 T is in the positive x direction. At that instant the magnitude of the magnetic force on the electron is:

• A) 0
• B) 3.8 *10^-14 N
• C) 5.1 * 10^-14 N
• D) 6.4 * 10^-14 N
• E) 7.5*10^-14 N

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