Aparticle with a charge of +10 μc is moving at 390 m/s in the positive z-direction. (a) find the minimum magnetic field required to keep it moving in a straight line at constant speed if there is a uniform electric field of magnitude 125 v/m pointing in the positive y-direction. (b) find the minimum magnetic field required to keep the particle moving in a straight line at constant speed if there is a uniform electric field of magnitude 125 v/m pointing in the positive z-direction. explain (show all work) for each answer. (a) -0.321 ti