The electrons in the beam of a television tube have a kinetic energy of 2. 85 x 10⁻¹⁵ J. Initially, the electrons move horizontally from west to east. The vertical component of the earth's magnetic field points down, toward the surface of the earth, and has a magnitude of 1. 75 x 10⁻⁵ T. What is the acceleration of an electron due to this field component?