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# Electromagnetism Investigation.

Extracts from this document...

Introduction

## Electromagnetism Investigation

Physics - Electromagnetism

Planning

Previous Scientific Knowledge.

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 or a more magnetised core.

Magnets were formed when certain molten metals, (iron, nickel and cobalt,) cool .

Middle

Apparatus

Electromagnet.

Crocodile 2.5 M Wire Ammeter

Small Yellow Connector wire. Power Pack

Soft Iron Core

Method-Experiment 1

1) A 2.5 m electrical wire will be coiled around around a soft-iron core 30 times.

2) Crocodile clips will be connected to yellow connecting wires at each end.

3) These together with the ammeter will be connected up to the power supply as shown in the circuit diagram.

4) A fixed amount of iron filings will be poured over the electromagnet with the power switched on.

5) The wire will be shaken until no more iron filings come off.

6) The power will be turned off. All of the iron filings that drop off will be weighed.

I will vary only the current in this experiment. All other factors will be kept constant. I will measure the amount of iron filings at 1,2,3,4 & 5 amps. I will repeat each experiment three times for accuracy.

Method-Experiment 2

1) A 2.5 m electrical wire will be coiled around around a 2) Crocodile clips will be connected to yellow connecting wires at each end.

3) These together with the ammeter will be connected up to the power supply as shown in the circuit diagram.

4)

Conclusion

Conclusions-Experiment 1

The Scientific Explanation-Experiment 1

As the current is passed on to the wire, it becomes a magnet itself, in accordance with the right hand rule. It magnetises the ÔsubstanceÕ at the core. Inside the ÔsubstanceÕ there are domains. When they are magnetised they aligned themselves onto the same direction , making it magnetic, This needs energy to perform and maintain the process, it is not cumulative so the more energy put into it the more will come out.

Clear Patterns: Method-Experiment 2

This is similar to experiment one, except there is a curve is. Here there is a very clear curve. It starts very closely and then raises increasingly rapidly. It starts of very slowly and then as more power is put in, it rises faster and faster. This shows that one coil does not increase the magnetic power one unit- the m

Conclusions-Experiment 2

The number of coil around an electromagnet is not proportional to the electromagnetic strength.

Scientific Explanation-Experiment 2

When more coils are in contact with the core, which is what the experiment shows, more area of interaction is available, allowing more domains to be magnetised quicker than if the area is smaller. So if there is more area, the magnetic area will become stronger. there is a kind of activation energy.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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