Hi, I have two questions that come from a unique example of magnetism. Here is the scenario: a thin and long piece of iron is placed in between a magnet and the north pole faces the outing sheet and some iron tacks. The iron tack do not get attracted to the iron even though a south pole is induced. 1) when this happens two south poles are in the middle of the thin iron sheet however, the iron pins do not get attracted towards it. While if the iron sheet is free to move, it would be attracted towards the magnet. From this I came with a conclusions: for attraction to occur, there must be both a magnetic field and also a pole to be present. If a pole is present but no magnetic field is emitted by it, then even magnetic materials won't be attracted to it and vice versa. Is this conclusion correct? 2) if the thin iron sheet is extended to a great length, will the magnetic field lines exit in the middle of the iron sheet to go back to the south pole or will it go through the whole iron sheet? I think that it shouldn't go through the whole thing as the distance all the way back when it leaves the ends will cause it to weaken and disappear before reaching the south pole. However, it seems weird that it would leave in the middle of the sheet. So I'm not very sure about this. 3) if there is a piece of iron bar in between two magnets, and the two side of the magnet which faces the iron is north then how will the iron bar be induced? Will the one with a stronger magnetic field cause the induction but as a result the temporary magnet will be weaker due to the presence of the other magnet? And if they are of equal strength then it won't be magnetised at all? Due to the magnetic fields cancelling each other out? Thanks for all the help guys!