what is one advantage of using electromagnets instead of permanent magnets
Electromagnet The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.
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Vein Veins are less muscular than arteries and are often closer to the skin. There are valves in most veins to prevent backflow.
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