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Investigating the factors affecting the strength of an electromagnet.

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Electromagnet Investigation


I will be investigating the factors affecting the strength of an electromagnet.

An electromagnet produces a magnetic field around the wire, it is made by passing current through a coil of wire. The strength of the field is affected by:

  • Number of coils
  • Increased current
  • Softer Iron core

I will see if the electromagnet is more powerful when the current is increased.

I will keep all of the factors of the investigation the same, to make it a fair test, this includes the same amount of coils and supply voltage.


The apparatus that I will require are:

  • A 2v Power Supply

  • An Ammeter
  • A Variable resistor
  • An Iron Bar
  • Wires
  • Crocodile clips
  • 100 Paper clips

To carry out the investigation, I will first collect all apparatus and set up the circuit (as shown below).

...read more.



After carrying out the practical experiment, I recorded the results and worked out an average, both of which are displayed in the following tables:




...read more.


        These results also fully support my prediction because there is a stronger magnetic field as the current increases.


I think my method of carrying out the experiment, was a good and reliable one because when repeating the experiment there was only a 3 paper clip difference.

As there was only 3 a paper clip difference, I think the experiment was carried out accurately. To improve the reliability of the results I could have repeated the tests again, but I am certain there will always be a maximum of 3 paper clips difference.

        I think my results are good enough to support a firm conclusion that when the current is increased, so is the strength of the magnetic field.

        To improve my investigation I could change the supply voltage, change the number of coils around the Iron bar and even increase the amperage to make the investigation longer.

...read more.

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