I have a few problems that I'm not sure how to do (not sure what equations to use), can anyone help me? 1) At a certain location, the horizontal component of the earth's magnetic field is 2.3 x 10^-5 T, due north. A proton moves eastward with just the right speed, so the magnetic force on it balances its weight. Find the speed of the proton. 2) The electrons in the beam of a television tube have a kinetic energy of 3.23 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 1.85 x 10^-5 T. What is the acceleration of an electron? 3) A magnetic field has a magnitude of 0.0011 T, and an electric field has a magnitude of 3.9 x 10^3 N/C. Both fields point in the same direction. A positive 2 micro-C charge moves at a speed of 3.7 x 10^6 m/s in a direction that is perpendicular to both fields. Determine the magnitude of the net force that acts on the charge. 4) A beam of protons moves in a circle of radius 0.36 m. The protons move perpendicular to a 0.44-T magnetic field. (a) What is the speed of each proton? (b) Determine the magnitude of the centripetal force that acts on each proton.