Are bar magnets stronger than horseshoe magnets?
No. Because a bar magnets sides (north and south) are far apart, but on a horseshoe magnet the sides (north and south) are close together which makes it stronger.
There are some variables like what the magnet is made of and how it was initially magnetized. If a bar magnet is bent into a horseshoe shape to make a horseshoe magnet, the magnetic field will be more dense (stronger) across the gap of the horseshoe magnet than it would have been anywhere around the bar magnet from which it was made. And since magnets are strongest at their poles, horseshoe magnets can use both…
No. The strongest magnets are neodymium magnets. Additional answer The shape of a magnet has nothing to do with its strength. Horseshoe magnets are made so that both poles are roughly in the same position, whereas bar magnets have the poles some way apart. But they could both be of the same strength.
In general, magnets are brittle and will break before they bend. And yes, refrigerator magnets bend, but in them the magnetic material is powdered. But if we took a bar magnet and bent it, we'd have a horseshoe magnet. It's not quite that simple to make a horseshoe magnet, but it isn't too tough, either.