2. The longer the wire, the more coils will be. Therefore the stronger the magnet will be.
3. The more or current is, the stronger the electromagnet will be.
Method: First of all we set up the equipment as shown in the diagram and according to the circuit. The first wire length we used is 100cm. As the circuit is completed we on the power pack and set the current on 1 amp. After that we hanged as many as paperclips the magnet could handle and recorded the result down. Then we have set the current on 2 amps and hanged the paperclips and then wrote the number down. After that we have done the same stages but with a wire of a length of 125cm (1amp &2amp). We also did the same thing with a wire of length of 150cm then 175cm and then last with 200cm. All of them were done with 1 amp then again with 2amps of current.
What else we did was measuring the power of the electromagnet by using a Newton meter. We used the same method. The different lengths, different amperes but what is different was that we used Newton meter instead of paperclips.
Fair Test: For it to be a fair test every time we do the practical throughout the days, we should use the equipment to avoid any problems made by any other groups.
Result:
Conclusion:
As I predicted, results showed that the more current, the stronger the electromagnet is.
The pattern on my graph showed that too. Also when I did the Newton meter experiment the pattern and trend on my graph nearly showed the same thing which supported my predictions. As I wrote in the background information which was kind of the same of my second prediction, the information showed that each coil of a wire has a magnetic field going around it and that proved that if the number of coils around the nail increases, the electromagnetic field increases too and that what my results exactly showed.
Evaluation:
I predicted that only an iron core or nail will actually work and I should of did the experiment with different kind of materials. But the time did not help me to do that. We all should of used the group of equipment as I said in the fair test, but we did not and that night affected our results. I clipped the ends of the wire with crocodile clips and they were made by metal which might of touched the core and made a short circuit, which in turn affected the results and the number of paperclips picked up.
We did the experiment throughout days and in these days we used different Newton meters and that may affected the results because some of the Newton meters were made totally from metal and this would affect the pull of the electromagnet.
On the second graph I had an anomalous point and if we had time then we would do it again to see the difference or to take the average.
We con extend the experiment by doing it with 3 amps then 4 amps. Also we can use longer wires like 4 to 5 metres. We can also use small compass or iron filings to investigate the direction of the field near electromagnets. All of these could of improved the investigation.
