Problem 1. A proton moves perpandicularly to a magnetic field that has a magnitude of 4.70*10^-2 T. What is the speed of the particle if the magnitude of the magnetic force on it is 2.12*10^-14 N? Answer in m/s. Note: What formula should I use? Problem 4. A proton moves straight upward (away from the ground) through a uniform magnetic field that points from east to west and has a magnitude of 4.7 T. a. If the proton moves with a speed 1.5*10^7 m/s through this field, what is the magnitude of the force acting on it? Answer in N. Note: What formula should I use? Problem 8. The magnetic force on a straight 0.37m segment of wire carrying a current of 4.5 A is 0.60 N. What is the magnitude of the component of the magnetic field that is perpendicular to the wire? Answer in T. Note: What should i do first? Problem 10. Given: g=9.81m/s^2. A thin 2.18m long copper rod in a uniform magnetic field has a mass of 52.2g. When the rod carries a current of 0.260 A, it floats in the magnetic field. What is the field strength of the magnetic field? Answer in T. NOte: Where do i start?