1. (20 pts) (Multiple Choice) Please circle the correct answer for each question. If you change your answer, be sure to indicate which is your final answer. An explanation is not required but is required for partial credit. (i) (5 pts) A positively charged particle with some velocity moves into a region of constant uniform magnetic field and comes out the other side, as shown in the figure below. What direction must the constant field be for this circular motion to be possible? Region of Constant B XXXXX XXXXX XXXXX 1 XXXXX A B C D