Electromagnetism Investigation

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AJMAL YAQOOB 11HS

Electromagnetism Investigation

Planning

When insulated wire is wrapped round an iron nail and the ends of the wire are connected to a battery the nail becomes capable of picking up iron filings and paper clips. This is called an electromagnet. The nail is magnetised by the current in the wire. If the battery is disconnected then the iron clips will fall off. This is because most of the magnetism has been lost.

The passage of an electric current along a wire creates a magnetic field around the wire. The fields are in the shape of a series of concentric rings. The more coils used in the electromagnet, the stronger the magnet is. If there is one coil, and another is added, then the two coils have twice the strength of one. This is because the current going through the wire makes the soft-iron core is the factor that induces electromagnetism, as so when there is more current, there will be more wire or a more magnetised core.

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Magnets were formed when certain molten metals, (iron, nickel and cobalt,) cool. Normally when the atoms in a non-magnetic crystallise, the atoms point in random directions. But because of the properties of the metals mentioned, these atoms line up into parts of the magnetic with similar directions called domains. This is because the earth has a magnetic field, and the atoms in the metal all follow these magnetic lines and form these domains. This is similar to what happens when an electromagnet is formed.

Prediction

I think that the more current that goes through the wire, the greater the electromagnetic ...

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