Which image represents a solenoid? A coil of wire with magnetic field lines going through coil and then curling around and back up and through the coil. A coil of wire around a iron bar with magnetic field lines going through coil and then curling around and back up and through the coil. A horizontal bar magnet with the north pole on the right and south pole on the left. Magnetic field lines are leaving the north pole and curling around to go in the south pole.