Why should the material used for making permanent magnet have high coercivity?
The figure illustrate how B , the flux density inside a sample of unmagnetised ferromagnetic material varies with B0 , the magnetic flux density in which the sample is kept. For the
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I have a bar magnet and an unmagnetized iron bar that appear identical. Using only those to objects, how do I determine which is the magnet and which the plain iron bar? -
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Magnetism Multiple Choice
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