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InterviewSolution
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lengthwise division of bar magnet |
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Answer» There are two ways to think about it. As you know, like magnetic poles repel each other and unlike poles attract. When you try to put them back together, the two poles of each magnet repel each other. The reason the magnet doesn't fall apart to begin with is that the strength of the material is strong enough to overcome the repulsion. If you cut a bar magnet crosswise, the two pieces will cheerfully attract each other because they are of opposite sign. The other way of looking at it, a bit more obscure perhaps, is that there is an energy density associated with magnetic fields. It's a bit complicated but the essential point is that the total energy is proportional to the square of the magnetic field integrated over space. The total energy of the two halves put together is more than twice the total energy of the two halves separated far apart. So there will be a force pushing them apart. plz explain this |
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