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Producing an electromagnet.

Extracts from this document...

Introduction

Duncan Howells

Science Investigation:

Plan

In order to produce an electromagnet you need to have a soft iron core and wire. You need to coil the wire around the iron core and pass a current through the wire to get a magnet.

You can vary the strength of this magnet in a number of ways:

• Change the number of turns on the coil
• Alter the size of the current
• Alter the size of the iron core
• Change the shape of the iron core
• Change the material of the core
• Change the ways in which the coils are wrapped around the core
• Change the nearby magnetic fields

To find out how the electromagnet is affected when the variables above are changed I will take one of the variables and record how the magnet is affected by it’s change. I will not change any of the other variables to ensure I’m carrying out a fair test.

I have decided to vary the current passed through the electromagnet. I shall do this by using a variable resistor in the circuit and by altering the voltage from the power supply. I will vary the current over a range of 5 Amps (0 – 5A).

Middle

88.8

3

290

By doing these preliminary results I determined that I will defiantly be using a wider range of results in the proper experiment (current 0-5A). I also determined that the number of coils I used (30) was suitable for the experiment. I also learned the best way of doing the experiment so I get the most accurate results.

Proper experiment results 1

Note: Iron nail weighs 13.4g

Conclusion

I think that the method I used was on the whole a good, efficient and reliable one. I think this because my results were quite accurate. I don’t believe that there was anything I could change to make the method any more accurate.

If I had more time to continue my investigation I could carry out some extra work to further it.

I could do another experiment which uses a similar method to demonstrate the effect on the magnetic field around a wire whilst a current is flowing through it.

A wire is coiled round an iron nail as before and set up in a circuit much similar to the one I used. A current is then passed through the circuit and wire, magnetising the nail. I would then place the nail over a pile of iron filings and the filings should stick to the nail. I would vary the current and the number of coils and see how the amount of filings attracted to the nail varies when the aforementioned factors are changed. This should give me a good idea of how the current and magnetic field around that current are directly proportional.

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

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