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# Experiment to Investigate which Factors Affect the Strength of an Electromagnet

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Introduction

Experiment to Investigate which Factors Affect the Strength of an Electromagnet Introduction An electromagnet is a magnet made of a solanoid with coils of wire around it. Aim To investigate which factors affect the strength of an electromagnet. Predictions I predict that the voltage, the amount of coils and the material of the solanoid can affect the strength of a magnet. I also predict that adding more coils increases strength. See domain theory. The Domain Theory The domain theory is that all the atoms point different ways in a piece of iron. When the piece of iron is magnetised all the atoms in the iron point to north. Variables The variables are the number of coils and the strength of the magnet. ...read more.

Middle

Nail (soft iron) Heat proof mat Stand and clamp Paper clips Circuit Diagram Preliminary Experiment In the preliminary experiment I will check the circuit to see if it works. I will also check the voltage and how many coils (for start). Obtaining Evidence No. of Coils No. of Coils 10 9 20 43 30 25 40 46 50 47 60 50 70 50 80 50 90 50 100 50 No. of Coils No. of Coils 10 12 15 17 20 33 25 38 30 40 35 42 40 45 45 47 50 49 55 50 Analysing Evidence I have found simply that the more coils there are the more paper clips are attracted. ...read more.

Conclusion

Our experiment was fairly accurate except our preliminary experiment results were anomalous in some places because there was one point when we added coils and the number of paper clips went down. The variables were kept constant and the reliability of the experiment could have been improved if we could have acquired more results. The evidence is sufficient to support a firm conclusion although the nail could have been magnetised because of past experiments. The experiment could be improved by extending the time, the length wire, and the amount of paper clips. A longer nail could be included as well as using a Newton meter and better timing could also be used. To extend the enquiry I suggest looking at the voltage and other materials. Lliam Heavey Physics Coursework ...read more.

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## Here's what a teacher thought of this essay

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This is an average piece of work. There is little evidence of true scientific understanding of magnetism. However, there is an understanding of how to undertake an investigation and how to collect and display data effectively, although caution should always be taken when using ICT to produce graphs.

Marked by teacher Kate Gardiner 01/03/2013

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