EARTH SCIENCE
MAGNETISM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A magnet created when electric current flows through wire coiled around an iron bar
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A magnet created when wire is wrapped around an iron bar
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A magnet that is attracted to anything with an electric current
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None of the other answer choices
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Detailed explanation-1: -This is called a ferromagnetic-core or iron-core electromagnet.
Detailed explanation-2: -Electromagnets. Electromagnets are a different from permanent magnets. 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-3: -An electromagnet is a temporary magnet made by winding a coil of wire around a piece of soft iron.
Detailed explanation-4: -When current flows through the electromagnet, it becomes magnetized, and its poles are repelled by the like poles of the permanent magnets. This causes the electromagnet to rotate toward the unlike poles of the permanent magnets.
Detailed explanation-5: -Electromagnets can be created by wrapping a wire around an iron nail and running current through the wire. The electric field in the wire coil creates a magnetic field around the nail. In some cases, the nail will remain magnetised even when removed from within the wire coil.