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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


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.


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.

...read more.


As you can see in the diagram the variable resistor is set in series, and the voltmeter in parallel and ammeter in series.The ammeter is used to check the current is kept consistent. The apparatus we used are listed below:-

1.variable resistor




5.iron nail

6.newton meter

7.power pack

To start of with I connected everything up using crocodile clips, and also did the experiment standing up for safety reasons. Then i put the power pack up to 4v, so that it would work efficiently and things wouldn’t get too hot to handle.


For safety i will ensure im always standing up, to avoid any awkward situations which could arose. Standing up is much more easier to get out of the way of certain hazards. Secondly i will conduct the experiment on a wooden surface, to ensure if any electrical problems happen it will no be conducted. Thirdly, i will not conduct the experiment anywhere near any wet surfaces, or taps etc, this is mainly because water is very conductive of electricity, and could cause electrical shocks. Also i will not be conducting the experiment direct from the mains, because the voltage is too large, and could be very dangerous, instead i will be using a power pack, which is much more safer then the mains.

Fair test

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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.

...read more.

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