You are given three identical looking but one which is magnet the other made up of a magnetic material and third made of a non magnetic material using these three bus how will you find out which is which
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My first thought is to place them on something small that floats enough to hold the weight of the bar without sinking. The magnet will align itself with the Earth’s magnetic field and act like a compass, but the unmagnetized bar will not. But this violates the “without using any other substances” requirement.
If we know that the bars are thin and that the magnetized one is magnetized on its longest axis (that is, the north and south poles are at the tips of the bar, not the sides), then forming a “T” shape with the two bars will reveal which one is the magnet. There will be a much stronger attraction when the vertical part of the T is the magnet, since the magnetic flux is strongest at the tip. This is the more elegant answer, but it would be very hard to apply if the bars were shaped, say, as perfect cubes.
If we know that the bars are thin and that the magnetized one is magnetized on its longest axis (that is, the north and south poles are at the tips of the bar, not the sides), then forming a “T” shape with the two bars will reveal which one is the magnet. There will be a much stronger attraction when the vertical part of the T is the magnet, since the magnetic flux is strongest at the tip. This is the more elegant answer, but it would be very hard to apply if the bars were shaped, say, as perfect cubes.
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