rns: Method-Experiment 2This is similar to experiment one, except there is a curve is. Here there is a very clear curve. It starts very closely and then raises increasingly rapidly. It starts of very slowly and then as more power is put in, it rises faster and faster. This shows that one coil does not increase the magnetic power one unit- the mConclusions-Experiment 2The number of coil around an electromagnet is not proportional to the electromagnetic strength.Scientific Explanation-Experiment 2When more coils are in contact with the core, which is what the experiment shows, more area of interaction is available, allowing more domains to be magnetised quicker than if the area is smaller. So if there is more area, the magnetic area will become stronger. there is a kind of activation energy.The four factors that affect the resistance of a piece of wire:Length,Diameter or thickness,Temperature andThe type of metal.EvaluationIn the Analysis and the graph I have shown two main anomalous points, this means that there must have been a slight error in my experiment. As the wire, length is bigger at these points I found it harder to stretch it out and consequently, measure it accurately. Although the graph is overall accurate and the results precise it is easy to see, the anomalous averages plotted because they do not all lie along the same best-fit line. The graph shows that my results are reliable as there are only two main anomalous points, (which are easily accounted for) to improve the reliability of my results, I could do more repeats in doing this my average would be more reliable. As I increased the wire length, the wire became hotter and gave off heat. This could explain why the anomalous results are at the top of my graph, 100cm and 95cm. I think one of the reasons why my experiment is quite accurate is because I tried to measure the wire as accurately as possible. The metre rule was selotaped onto the workbench. The wire was stretched...
