Magnetic Force on Moving Electron · PhysicsBowl 2018 #37
Physics · electromagnetism
Problem
An electron is traveling due north and has a speed of 4.0 x 10⁵ m/s. It enters a region where the Earth's magnetic field has the magnitude 5.0 x 10⁻⁵ T to the north and directed downward at 45° below the horizontal. What is the magnitude of the force acting on the electron?
(A) 2.3 x 10⁻¹⁸ N (B) 3.2 x 10⁻¹⁸ N (C) 4.2 x 10⁻¹⁸ N (D) 2.3 x 10⁻¹⁷ N