when dr. hewitt turns the magnet around and places the current-carrying wire between the poles of the magnet for the second time, then the wire jumps up.
anything that can produce a magnetic field around itself and draw iron with it is a magnet. Every known element and numerous compounds had undergone magnetism testing by the end of the 19th century, and it was found that each one of them contained some magnetic properties. The only three elements that exhibit ferromagnetism are iron, nickel, and cobalt.
All ferromagnetic materials exhibit hysteresis, a lag in response to shifting pressures brought on by energy losses from internal friction. When B is measured for various values of H and the results are visually displayed, a loop of the form shown in the accompanying figure is created. A hysteresis loop is what this loop is called.
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