(15 points) Which of the following statements are true? If false, rewrite the statement to make it true. a) Magnetic field lines start on a north pole and end on a south pole (or go to infinity). b) The north pole of a magnet is attracted to the north geographic pole of the earth. c) The north pole of a magnetic can never be separated from a south pole. d) Currents in parallel wires repel when the currents flow in opposite directions. e) The direction of the force on a current is along the direction of the magnetic field