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How Different Amplitudes Affect the Strength of an Electro Magnet.

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Daryl Breakwell                           11KR                          Physics Coursework

How Different Amplitudes Affect the Strength of an Electro Magnet



Equipment List

2 Iron ‘C’ cores

Boss stand and clamp

Variable Voltage Power Supply (VVPS/Power Pack)




I will measure the current using an ammeter, as the voltage is to small to measure, and the amplitude (current) is whole numbers. To measure the strength of the electro magnet I will hold it in a boss stand and clamp. I will then add 100g weights until the iron core the magnet is not strong enough and breaks its link with the core. I will have eight coils on the magnet, as any more and it would be to strong. I will repeat do the experiment at 0.0, 0.2, 0.4, 0.6, 0.8, 1.0 amps. I will then repeat it 3 times and take an average of my results and plot them on a graph.

Factors to vary, control or take into account

In my experiment, I could vary several things such as: the amplitude (current), the voltage, the amount of coils on the magnet, the size of the core or the type of wire used. To make it a fair test I will use the same equipment, keep everything the same, apart from the varying factor.

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Current (Amps)

Mass 1 (g)

Mass 2 (g)

Mass 3 (g)

Average (g)































The results in red I think are anomalous results so did them again and put then into the table again. The results in blue are the averages; they have been affected by the anomalous results so I will have to work tem out again.

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My results were as I expected them to be, once I had repeated the anomalous ones. I think my results are good enough to make a firm conclusion.


I could have used smaller mass weights instead of 100g weights, this would have given me more accurate results as I could have found how many I would hold to the nearest gram, this would also make the results differ more as there would be less grams so it might hold a slightly different amount each time .The only problem is that the school did not have 1 gram weights and it would have taken a lot longer to get the results.


If I had more time I would take some more results after 1.0 amps to see if I have actually reached the magnets full capacity, to do this I would take readings from: 1.2, 1.4, 1.6, 1.8, and 2.0 Amps.

I would also retake 0.2 and maybe 0.1 with 1 gram weights to see how much they would hold, as they would not hold 100 grams, this would also make my graph more accurate.

Page  of 7

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