SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Iron filings reveal magnetic field lines around an electrical wire.
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A magnet moved through a coil of electrical wire produces a current.
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Electrical wires have a positive (+) and negative (-) poles just as a bar magnet does.
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The magnetic field lines run east and west in a bar magnet, but they run north and south in a coil of wire.
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Detailed explanation-1: -To demonstrate that an electric current (i.e., moving electric charge) generates a magnetic field, all you need do is simply place a magnetic compass next to a wire in a circuit. When current is passed through the wire, the compass will deflect, indicating the presence of a magnetic field circling the wire.
Detailed explanation-2: -1820-Electromagnetism, Current In 1820, a physicist Hans Christian Oersted, learned that a current flowing through a wire would move a compass needle placed beside it. This showed that an electric current produced a magnetic field.
Detailed explanation-3: -Iron filings are small shavings of a ferromagnetic material. Ferromagnetic (for the purposes of this page, at least) means that they will align themselves with a magnetic field. That being the case, iron filings are an excellent way to display the magnetic field of one or multiple bar magnets.
Detailed explanation-4: -With iron filings or with plotting compasses As the filings are scattered around the magnet they become temporary magnets (by magnetic induction) and line up end-to-end. The filings tend to clump together around the poles of the magnet, indicating that this is where the magnetic field is strongest.