I've got two homework questions I don't really understand. Coming to the end of the year so my teacher is rushing through things and forgetting to give us all the notes we need.. I think I need an equation to solve both of em, but I don't know what. Help/an explanation on how to do the problem is greatly appreciated. ^_^ #1) A proton moves at right angles to a magnetic field of .124 T with a speed of 2.3x10^7 m/s. Find the magnitude of the acceleration of the proton. #2) A proton moves eastward in the plane of Earth's magnetic equator so that its distance from the ground remains constant. Assume the Earth's magnetic field at the equator is 3.23 x 10^-5 T. The acceleration of gravity is 9.8 m/s^2. What is the speed of the proton?