Awire is wrapped multiple times around a galvanized or aluminum nail and then each end of the wire connected to a battery for some period of time. what happens when the nail is then positioned next to a paper clip and why

a)the paper clip is repelled away from the nail because an electromagnetic field magnetized the nail

b)the paper clip is attracted toward the nail because an electromagnetic field magnetized the nail

c)no effect at all on the paper clip from the wire or the nail

d)the paper clip straightens out because of ohm's law

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.