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• Level: GCSE
• Subject: Maths
• Word count: 1178

See how the induced voltage changes when you pass a magnet through a coil of wire

Extracts from this document...

Introduction

Planning

Aim

My aim is to see how the induces voltage changes when you pass a magnet through a coil of wire. I will change the speed of the magnet moving through a coil and also the number of coils through which the magnet passes.

Planning

Michel Faraday discovered electromagnetic induction in 1831. In many ways it was one of the most important discoveries without it appears that there would not be any generated electricity. In this investigation I will use a cathode-ray oscilloscope to measure the induced voltage from the magnet moving through the coil. The reason why there is an induced voltage is because the magnetic field of the magnet cuts through the wire and pushes the electrons along the wire. This happens when you move the magnet forwards and backwards. As Faradays law said that the voltage will increase when:

1. The number of coils is increased.
2. The strength of the magnet is increased.
3. The speed at which you move the magnet thought the coil increased.

Middle

Method

1. Set up the apparatus as shown.
2. The ruler has to be at the height where the coils are the highest.
3. Height 0 is not the ground it is the highest point of the coils.
4. Measure the right height from which you will drop the magnet.
5. Drop the magnet and measure what voltage you get out.
6. Repeat this for every single height and different number of coils.
7. Don’t change the coils when you change the height you need to keep one of them constant.

Obtaining

What was the voltage I got from dropping the magnet through a coil of wire?

Conclusion

Evaluation

My investigation went well and I had one anomalous result. It occurred on the changing height experiment on the last height of 40 cm. It did not fit into the pattern so I thought it was an anomalous result. I took average for each height and when I changed the number of coils because it was very hard to measure the voltage out and to release the magnet from the right height. The anomalous result was from 40 centimetres height and that the hardest height from, which you can drop the magnet. The oscilloscope was not accurate in measuring voltage the scale of it was simply too large to get very accurate results.

The repetition of the experiment

If I had to repeat the experiment I would firstly search for more accurate and simpler equipment to the oscilloscope because the readings which were taken from it were not very accurate and that’s why I took an average of all of mine results so I can get some sort of idea of what they are meant to be.I would also change the height because it is very hard to drop the magnet from the correct height.

This student written piece of work is one of many that can be found in our GCSE Height and Weight of Pupils and other Mayfield High School investigations section.

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