• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Producing an electromagnet.

Extracts from this document...


Duncan Howells

Science Investigation:


In order to produce an electromagnet you need to have a soft iron core and wire. You need to coil the wire around the iron core and pass a current through the wire to get a magnet.

You can vary the strength of this magnet in a number of ways:

  • Change the number of turns on the coil
  • Alter the size of the current
  • Alter the size of the iron core
  • Change the shape of the iron core
  • Change the material of the core
  • Change the ways in which the coils are wrapped around the core
  • Change the nearby magnetic fields

To find out how the electromagnet is affected when the variables above are changed I will take one of the variables and record how the magnet is affected by it’s change. I will not change any of the other variables to ensure I’m carrying out a fair test.

I have decided to vary the current passed through the electromagnet. I shall do this by using a variable resistor in the circuit and by altering the voltage from the power supply. I will vary the current over a range of 5 Amps (0 – 5A).

...read more.





By doing these preliminary results I determined that I will defiantly be using a wider range of results in the proper experiment (current 0-5A). I also determined that the number of coils I used (30) was suitable for the experiment. I also learned the best way of doing the experiment so I get the most accurate results.

Proper experiment results 1

Note: Iron nail weighs 13.4g

...read more.


I think that the method I used was on the whole a good, efficient and reliable one. I think this because my results were quite accurate. I don’t believe that there was anything I could change to make the method any more accurate.

If I had more time to continue my investigation I could carry out some extra work to further it.

I could do another experiment which uses a similar method to demonstrate the effect on the magnetic field around a wire whilst a current is flowing through it.

A wire is coiled round an iron nail as before and set up in a circuit much similar to the one I used. A current is then passed through the circuit and wire, magnetising the nail. I would then place the nail over a pile of iron filings and the filings should stick to the nail. I would vary the current and the number of coils and see how the amount of filings attracted to the nail varies when the aforementioned factors are changed. This should give me a good idea of how the current and magnetic field around that current are directly proportional.

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Electrical & Thermal Physics essays

  1. resistivity if a nichrome wire

    (1.5 x 10 -4) 2 = 7.07 x 10 -8 m. (This is my result for the cross sectional area of the nichrome wire.) 2) Finding the gradient 14.6 / 0.9 = 16.2 ? m-1 3) Working out the resistivity These two figures will now help me to work out the resistivity of the nichrome wire.

  2. Investigate the relationship between electromagnet strength and amount of current flowing through the wire.

    This means that the electromagnetic field will be very weak, enabling the electromagnet to pick up small loads of mass. However, as the current increases, more and more domains will be lined up, increasing the mass that the electromagnet will be able to lift, and causing the gradient of the

  1. Investigating the factors affecting the size of current flowing through a length of resistivity ...

    In a series of pipes (wires), water (current) flows around the system (circuit). If the pipes are twice as wide, double the amount of water will pass a certain point in a certain amount of time. In the same way, doubling the cross-sectional area of the putty will double the amount of current flowing through it.

  2. The strength of an Electromagnet

    volts, so as not to blow the fuse of the power pack, as many of my fellow experimenters did.

  1. Find out what factors affect the strength of an electromagnet.

    Plan: I will plan a fair test to see if my factor (increasing the strength) makes a difference to the strength of the magnet. I will obtain at least three results and find the average between them when plotting the graph.

  2. The strength of an electromagnet.

    The iron core would then be a magnet. An iron core acting as a magnet looks like this: When you switch off the current, the domains would no longer be under the influence of an external magnetic field and the n the domains would begin to return to their original

  1. Find out the factors affecting the strength of an electromagnet.

    In my investigation they're five key factors, which I could change, but I am only going to change one of them. The variable that I am going to change is the current because I feel this is the easiest and most obvious one to do.

  2. Investigating the electromagnet using various amount of current.

    This is similar to what happens when an electromagnet is formed. Preliminary experiments; I did some preliminary experiments so that I could find out the range of the current, and how much voltage was needed in the experiment, and also exactly how far the electromagnet should be away from the iron bar.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work