until it was nearly in a straight line so a bit was overlapping at each end. As the metre rule was curved and worn down at the corners it was slightly hard to see where 0cm was. Finally, the inside edge of the crocodile clips were placed at the appropriate point. I still however would like to make the measuring more accurateKey Factors which could affect this experiment were : The metal that the core is made of. The accuracy of the amount of electricity being used. If the pins in the box are magnetised. If the core stays a permanent magnet after the electricity is turned off. If all the pins were made of the same metal.Table Because 0 pins should be attracted at 0 volts, I added a data point for 0,0 on the graph. This makes the best fit line more accurate.The results showed in bold are anomalous because they do not fit in with the pattern that the other results follow.The experiment may not have been a completely fair test, as we observed that the iron nail would attract about 1-2 pins when the electricity was turned off. This meant that the nail did become slightly magnetised but only by a small amount.ConclusionThe results did show that my predictions had been right. The amount of pins increased with increasing voltage, but the amount of pins started to stop increasing when the voltage was at 8 volts. This was probably because the electromagnet had almost reached the Magnetic Saturation point (i.e. it had almost attracted all that it could). The results also seemed to show a trend in the way they increased. Every time the voltage was increased by 1 volt, the amount picked up increased by roughly 2 grams.Probably the reason that some of the results were anomalous was because the voltage used wasn't precisely accurate as the dials on the Power Packs can be misread slightly. Also, some of the pins may have become magnetised, or the nail may have become a weak permanent magnet. These reasons could also account for the spread of data in t...
