Question7 (2 points) You stand near the earth's equator. A positively charged particle that starts moving parallel to the surface of the earth in a straight line directed east is initially deflected upwards. If you know there are no electric fields in the vicinity, a possible reason why the particle does not initially acquire a downward component of velocity is because near the equator the magnetic field lines of the earth are directed a. upward. b. downward. c. from south to north. d. from north to south. e. from east to west. Questions (2 points) A coaxial cable has an inner cylindrical conductor surrounded by cylindrical insulation and an outer cylindrical conducting shell. The outer shell carries the same current but in the opposite direction from that in the inner conductor as shown. If the coaxial cable sits in a uniform magnetic field directed upwards with respect to the cable, the effect of the field on the cable is a. a net force to the left. b. a net force to the right. c. a net force upwards. d. no net force but a slight shift of the inner conductor to the left and the outer con- ductor to the right. e. no net force but a slight shift of the inner conductor to the right and the outer con- ductor to the left. Question9 (2 points) One reason why we know that magnetic fields are not the same as electric fields is be- cause the force exerted on a charge +q a. is in opposite directions in electric and magnetic fields. b. is in the same direction in electric and magnetic fields. c. is parallel to a magnetic field and perpendicular to an electric field. d. is parallel to an electric field and perpendicular to a magnetic field. e. is zero in both if the charge is not moving.