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The aim of this investigation to see the strength of an electromagnetic by varying many variable, and seeing how this affects the performance of the electromagnet.

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Physics coursework Aim The aim of this investigation to see the strength of an electromagnetic by varying many variable, and seeing how this affects the performance of the electromagnet. Variables there are many variables which can increase or decrease the magnetism of the electromagnet. these are the following variables:- Number of coils:- the more the number of coils the more the electromagnetism because, each coil creates a magnetic field. So the more coils the more magnetic fields thus the magnetism increases. Current:- this will increase the number of electrons going around the electromagnet therefore increasing the amount of magnetism. Distance:- the distance the electromagnetic is away from the target object will also decrease the magnetism. Type of iron core:- the material of the iron core could dramatically change the amount of magnetism. Length of nail:- The length of the nail will be a controlling factor, because the longer the nail is the more coils can be fitted around the nail, thus making more magnetic fields, and increasing magnetism. Length of wire:- The longer the wire is, the more oppurtunity for making more coils and increasing magnetism. Also the longer the wire is, and the number of coils increase, also their will be more electrons available to travel around the iron nail, therefore increasing magnetism.


To ensure there is a fair test, all over varying factors will have to be kept constant. This includes, keeping the length of wire the same length and thickness. Also keeping the current the same so that the flow of electrons will be similar. Voltage will be determined by the power pack, and the switch will always be on 4v. The variable resistor will be used to ensure the correct amount of current is travelling through the wire. Also i will be using the same nail, so there is no chance of different length of nails, or different cores etc. The newton meter that i will be using, will be the same one for all experiments, so that the results become more accurate. Also i will ensure that it will only be a touch on the newton meter by the electromagnet, and no bias is being used. Prediction I predict that as the number of coils increase so will the amount of magnetism, because of the increase in magnetic fields. This will increase the reading on the newton meter. Also as the number of coils double so will the amount of magnetism double, increasing the amount of newtons being pulled will double. This graph shows what i will expect from my results, it is basically a line which is y=x.


Also all the results on a graph were in a very strong posotive correlation. There was no outliers visible on the graph either. Also, the experiment was repeated 3 times, and a great degree of accuracy was involved to make sure there was no biases or unfair testing. Everytime we tested the same value, the results were very similar or even the same, showing that there was no chance of anonymous results. This shows the experiment was very reliable, and that it should be good enough to make a firm conclusion, that as the number of coils increases, so does the magnetism in direct proportion. Conclusion I would like to do this experiment again, and have a much larger range, to see what happens when u extrapolate outside the points which i have tested, and wanting to know if the same formulas and proportions, and correlations apply. Also i would like to repeat the testing of each value up to 5 times so the accuracy is increased even more, and instead of analysing the mean, i would like to analyse the modal values. Also i would like to see how the other factors which affect the performance of the electromagnet, actually change the magnetism, and would like to test these, also to see if there is any further, interlocking formulas etc.

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