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Measure how the number of coils of insulated wire around the iron nail effects the amount of paper clips attracted to the electromagnet.

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Introduction

Introduction

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 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.

Aims

For this investigation, I intend to measure how the number of coils of insulated wire around the iron nail effects the amount of paper clips attracted to the electromagnet.

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Middle

The experiment could be affected by varying paperclip weights so to keep the experiment fair; I will only use paperclips of the same type.  And I will the same amount of paperclips – I will use 25 paper clips as the maximum. The amount of current going through the insulated wire could also fluctuate so I will use a power pack that will keep the current the same throughout the experiment. Also I will use the same iron nail and make sure I have demagnetised it after each experiment.

To keep the experiment fair, I will do the following:

· Make sure all the paperclips are the same.

· Have the same amount of paperclips.

· Keep the current the same throughout.

· Always use the same Iron nail.

· Keep the coils equally spaced.

Prediction:

I think that the more current that goes through the wire, the greater the electromagnetic pull of the iron nail will be. Therefore it will attract more paperclips.

Method

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Conclusion

Conclusion

I have shown in my experiment that my prediction “ I think that the more current that goes through the wire, the greater the electromagnetic pull of the iron nail will be. Therefore it will attract more paperclips was correct.” My graph shows some anomalous results, this could be due to the fact that I may have not demagnetised the electromagnet properly. And I may have had an odd result in one of the experiments, which would have altered the average.

Evaluation

        I could have made a different approach to this experiment. Instead of using paperclips as a form of measuring the strength of the electromagnet by using iron filings. With this experiment I would have measured how big the circles were that had been formed by the electromagnet. Another way of measuring the strength of the electromagnet is to use a Newton Meter to see how many Newton’s can be lifted. The trouble with this experiment is that the Newton meter will be suddenly released – this will make it hard to read what the actual weight was.

...read more.

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