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# Our aim for this experiment is to find out a method of increasing the strength of an electromagnet. My aim for this experiment is to see if the number of turns in the coil around a nail can affect the strength of an electromagnet.

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Introduction

ELECTROMAGNET INVESTIGATION

## Planning My Work

Our aim for this experiment is to find out a method of increasing the strength of an electromagnet. My aim for this experiment is to see if the number of turns in the coil around a nail can affect the strength of an electromagnet.

Whilst doing this experiment, we will need the following apparatus; an iron nail, a power pack, some wire to wrap around the nail, leads, crocodile clips, a variable resistor, and some paperclips.

The variables of this experiment, to change the strength of the magnet we could change the iron core; you can get soft iron and normal iron. You change the number of coils, change the current, or change the resistance, or change the thickness of the wire.

My partner and I chose to change the amount of coils around the nail, for our experiment.

'Soft' iron loses its magnetism very quickly when the current stops. Normal iron keeps its magnetism when the current stops.

There are also different methods, which we could use to test the magnetism of the electromagnet. We could either count the number of paperclips the magnet can pick up. We could weigh the amount of iron

Middle

10

30

18

40

30

50

42

60

50

70

64

80

80

The results look inaccurate just by looking at them. You can straight away see the anomalous result in the first couple of results. You can see that they are not very precise as it is clearly shows no pattern between the increase of coils and the increase of the number of paperclips it is able to pick up.

We corrected the faults. We connected a variable resistor into the circuit, so that the current was variable. We made sure that we did everything accurately and did the experiment three more times; these were the results we got.

 Coils Current (amps) Paperclips 20 3.10 3 30 3.10 3 40 3.10 11 50 3.10 21 60 3.10 25 70 3.10 31 80 3.10 48

You can see that there is one inaccuracy in the first couple of results. Apart from that the rest looks precise and you can see a clear pattern in the results. You can see that the result increase by an average of about 10 paperclips, every time you add 10 coils to the core.

 Coils Current (amps) Paperclips 20 3.10 3 30 3.10 5 40 3.10 10 50 3.10 24 60 3.10 24 70 3.10 27 80 3.10 54

These results also look quite accurate. They are

Conclusion

Current (amps)

Paperclips

20

3.10

3

30

3.10

4

40

3.10

10

50

3.10

22

60

3.10

26

70

3.10

29

80

3.10

51

These last sets of results are definitely my most accurate and precise, you do not see any anomalous result and u can see a clearer pattern.

 Coils Current (amps) Paperclips 20 3.10 03.00 30 3.10 04.00 40 3.10 10.33 50 3.10 22.33 60 3.10 25.00 70 3.10 29.00 80 3.10 51.00

These last set of results show the average out of the three. They are very much similar to the results that I had gathered from the previous test.

Analysing My Evidence

The more you increase the amount of coils, the stronger and larger the magnetic field becomes. The graphs below show that when you add ten more coils to the iron nail, about five-fifteen paperclips are attracted. So my prediction was right, when you increase the amount of coils, than the magnets magnetism also increases in proportion.

you can see that these graphs all resemble my predicted graph, they have a straight, diagonal line running from the bottom left of the graph to the top right.

This graph has a few more anomalous results but you can still see that it has the same pattern. When you increase coils, you increase the magnetism, and so the number of paperclips picked up will also increase.

These are my most accurate results, collected. The final set of results.

This is the average results graph and so it will be the most accurate data I have. You can see it has the best line.

Evaluating My Evidence

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