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# Investigation of electromagnetism

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Introduction

V.I.S ELECTROMAGNETISM INVESTIGATION OF ELECTROMAGNETISM CONTENTS contents 2 Aim 3 Hypothesis 4 method 5 results 7 conclusion 10 evaluation 11 AIM To find out the effect of number of turns, current and core material on the strength of an electromagnet and its behaviour towards these three points. HYPOTHESIS I think these three factors all influence the strength of electromagnets and their behaviour1: * The number of turns of wire. Because the more turns you have the more electrons are present in the wire which create a larger magnetic field. * The current flowing in the wire. Because this alters the strength of the electromagnet, and the force it is using gets bigger if the current increases. * The material the core is made of. I think a metal will be the best core material for electromagnetism, because its lattices and microscopic shape allow the current to induce the flow of the electrons and so can control the direction of flow, resulting in the build up of a magnetic field. In comparison wood has lots of different layers and shapes, so there for can not be induced. METHOD 1. Weigh and record the mass of a piece of paper which you will put on the balance. 2. Place a pile of iron filings on another piece of scrap paper. ...read more.

Middle

I want to keep these the same because they are not my testing variables. The altering variables are going to be the voltage on the power pack and so obviously the ammeter reading on the ammeter. The responding variable is the amount of filings picked up in grams. The type of core material that makes the best electromagnet, this experiment is to analyse the effect of material on electromagnetism. The number of turns will be 25* It will include a one cell power battery. The cores will be altered. Again the above applies for the continuation of the experiment. The cores include: iron, no core, steel, copper, brass and wood. The constant variables will be the wire and the turns of wire around the magnet as well as the voltage supplied by the battery. These are kept the same as to not influence the testing variable, which is to analyse how the core material affects electromagnetism. The responding variable will be the amount of filings picked up. This will all be recorded in a table as shown below. RESULTS Investigating the number of turns on the strength of the electromagnet Number of turns Mass of filings (g) 1 0.1 2 0.4 5 1.56 10 7.47 15 24.4 20 28.8 Investigating the effect of current on electromagnetic strength Current (amps) ...read more.

Conclusion

I think this aspect is the hardest to handle equally. It also interferes most with the results if something goes wrong. Looking at the results it is very clear what they show. By this I mean that the line of best fit shows a very strong correlation between the densities of the points. This indicates that the results were rather accurate. I was not very happy with the result of the core material. I was expecting iron and not steel to be the best core material. This is because from all materials iron has the best shape for inducing electrons and persuading them to flow in a direction. This was probably due to experimental failures. Other aspects I could investigate are temperature and how it influences magnetism. You could also look into the shapes of the materials. I think this aspect also affected our experiment. Because we had used different shapes for different materials, for each experiment. A larger area of material would have a stronger magnetic field, as it has a bigger surface area and so would have a stronger magnetic field. Generally I think it was an interesting experiment to do, and I also had enjoyed analysing the aspects of electromagnetism. 1 E.g. If the iron filings still fall off, after the circuit has been switched off. ?? (footnote continued) 2 11 ...read more.

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