10 4. The figure shows the path of an electron in a region of uniform magnetic field. The path consists of two straight sections, each between a pair of uniformly charged plates, and two half-circles. From the perspective as shown, determine the direction of the magnetic field, B, and the direction of the electric field, E, at charged plates at the top and bottom. B field (circle one direction): up down into page out of page left right E field top plates (circle one direction): up down into page out of page left right E field bottom plates (circle one direction): up down into page out of page left right