The Effect of Heating a Magnet
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-316
2025-11-26
44
If a sewing needle is magnetized and then heated to redness by being held in the flame of a Bunsen burner, it will be found, on testing it after cooling, that it has lost practically all its magnetism. This is probably due to the fact that, in heating, the vibrations of the molecules have increased in velocity until they no longer retain the positions which determine the polarity of the magnet. If the needle is heated red-hot from end to end, it cannot be picked up by a magnet, which shows that at that temperature steel is not a magnetic substance.
الاكثر قراءة في المغناطيسية
اخر الاخبار
اخبار العتبة العباسية المقدسة
