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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
A magnet can be either natural or manmade. In nature, magnetite (also known as lodestone) is a strong, permanent natural form of magnet that was used for centuries in compasses and other objects as a magnet. Other natural magnets are weak (pyrrhotite, ferrite, and columbite), so aren’t of much use as a magnet. Manmade magnets are far more commonplace in everyday use today and come in either temporary or permanent forms.
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