Consider a region in which there is a magnetic field B, which is such that it has magnitude B and direction in the positive x-direction. An electron enters this region such that its velocity is in the positive y-direction. (a) Describe the motion of the electron in this region by considering the magnetic force on it. (Hint: as a third direction use into the paper or out of the paper). (b) What can you say about the kinetic energy of the electron?