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# Electromagnet investigation

Extracts from this document...

Introduction

Tom Cole

11DSB-11R3

9061

25/6/02

Electromagnet investigation

An electromagnet works similarly to a normal magnet but with one huge advantage.  A normal magnet is constantly on but an electromagnet can be turned on and off.  This is useful in both the science lab and industry such as a scrap yard.  An industrial investigation of this size is obviously not possible in the science lab so in order to simulate a smaller type of situation I’m going to use small weights.

I plan to find out the different characteristics of an electromagnet by changing the number of coils around the electromagnet and the amount of current which is passed through it. My hypothesis is that the amount of current and or coils which are placed on the magnet will govern the strength of the magnet.

Middle

The investigation will require me to increase the amount of coils surrounding the iron bar.  100 coils will be the number I will use but this will change throughout the experiment.  I also plan to see how much weight the electromagnet will hold.

The weights which I will use are 10g each and the apparatus has been designed it will consist of a stand and clamp holding the iron core using a piece of iron I will support the weights from it.

I hypothesize that as the number of coils increases, so will the strength of the magnet.  This is also true with the current.  As I increase the current the magnet will become stronger.  This will happen because the stronger the current passing

Conclusion

Scientific Explanation

The current flows threw the wires surrounding the iron core, this creates a magnetic field this is caused as each wire has its own magnetic field so when one wire is curled around the iron bar you find that the magnetic field is twice as powerful and so on and so forth. So by increasing the current flowing threw the wires you increase the strength of the magnetic field, thus allowing the electromagnet’s strength increase to lift a much heavier weight.

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

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