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# The strength of an electromagnet

Extracts from this document...

Introduction

## The strength of an electromagnet.

Aim: To investigate the factors which affect the pick-up power of an electromagnet.

Circuit:

Diagram:

Background information: Electromagnets are easy to make and can be very strong. There is a magnet field around every conductor carrying a current.

An electromagnet can be made to have a field just like the field of a bar magnet. All you have to do is wrap the wire around a pencil to make a coil.

The field can be made a lot stronger if the coil is wrapped around a piece of iron. This is because the iron is turned into a magnet, and adds its strength of the field of the coil itself.

You can use a small compass or iron filings to investigate the direction of the field near electromagnets.

Predictions: 1.Only iron core will work as an electromagnet and no other material would.

2.

Middle

 Current (amps) Voltage (volts) Wire length (cm) No. of paperclips 2 5.2 100 4 2 5.2 125 6 2 5.2 150 7 2 5.2 175 8 2 5.2 200 9 2 5.2 225 11 2 5.2 250 12
 Current (amps) Voltage (volts) Wire length (cm)

Conclusion

We did the experiment throughout days and in these days we used different Newton meters and that may affected the results because some of the Newton meters were made totally from metal and this would affect the pull of the electromagnet.

On the second graph I had an anomalous point and if we had time then we would do it again to see the difference or to take the average.

We con extend the experiment by doing it with 3 amps then 4 amps. Also we can use longer wires like 4 to 5 metres. We can also use small compass or iron filings to investigate the direction of the field near electromagnets. All of these could of improved the investigation.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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