EARTH SCIENCE
MAGNETISM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It must be heated.
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It has to be touching another magnet.
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It must be lined up with Earth’s magnetic field.
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It must be connected to an electrical source.
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Detailed explanation-1: -Electromagnets are made of coils of wire with electricity passing through them. Moving charges create magnetic fields, so when the coils of wire in an electromagnet have an electric current passing through them, the coils behave like a magnet.
Detailed explanation-2: -If you disconnect the wire, the magnetic field disappears and the nail is no longer a magnet. If you leave the wire connected long enough, the nail’s magnetic domains will realign enough to make it a permanent magnet.
Detailed explanation-3: -What will change is your magnet’s polarity. One end of your magnet will be its north pole and the other end will be its south pole. Reversing the way the battery is connected will reverse the poles of your electromagnet.
Detailed explanation-4: -An electromagnet is a temporary strong magnet made from a piece of soft iron when current flows in the coil wound around it. It is an artificial magnet. The strength of magnetic field of an electromagnet depends on: Number of turns: The strength of magnetic increases on increasing the number of turns of the winding.
Detailed explanation-5: -Q. What must happen for an electromagnet to have a magnetic field? It must be heated.