Say if I magnetize a hollow cylindrical ring magnet by placing a staight current carrying wire along its axis. It will be magnetized with magnetic field lines running inside the cylinder clockwise or anticlockwise! So there will be no magnetic field lines outside the iron body? If I have a cylindrical hollow magnet or a magnet made by attaching two horse shoe magnets with magnetic field lines running along its length then, will there be any magnetic field lines outside the magnet? I think there will be because iron particles placed outside will get attracted to it. But how will these lines look?