I know that when there's a magnet next to a piece of iron, the former's flux density just travels across the air gap between them provided it's small enough. But what happens when there's two magnets next to each other? I know B follows the superposition principle, so do their flux densities just add up? Then, for two equally strong magnets separated by a small space, would the flux density in the air gap be ~2B? And is it different for attraction and repulsion? Because flux line diagrams make it seem so. On another question, if two magnets of different strength are put next to each other, do they remain unchanged, or their flux intensities eventually even out? EDIT: Sorry, this probably goes in the Classical Physics forum, doesn't it?