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Factors Affecting The Strength of An Electromagnet

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Factors Affecting The Strength of An Electromagnet Aim To find out the factor affecting the strength of an electromagnet when picking up paper clips. The idea was to count the paper clips that the electromagnet picked up. Predictions First of all, an electromagnet has to be defined. An electromagnet can also be called a Solenoid. An electromagnet can consist of just one wire, but usually an electromagnet is made up of wire coiled around a soft ferromagnetic core (a solenoid). This extract comes from the book ' The Working World of Physics', " Those like Iron, Nickel and Cobalt which are easily magnetised are called Ferromagnetic." Materials that only react in a very strong magnetic field are called Paramagnetic. What I think will happen is the current will flows through the wires of the solenoid and which will creates a magnetic field. By introducing more current, the magnetism will increase. ...read more.


This experiment was a fair test because: * The same power pack was used each time. * The same paper clip was used each time and they were all roughly the same weight. * Only one factor (i.e. the current) was changed. * The core of the electromagnet always had the same surface area. * The same equipment was used each time. * The pins were all made of the same material. Key Factors that could affect this experiment were: * The metal that the core is made of. * The accuracy of the amount of electricity being used. * If the paper clip I've already used are magnetised in the box. * If the core stays a permanent magnet after the electricity is turned off. Results of my Experiment My first test Current (Amps) Number of clips 0.00 0 0.10 4 0.20 6 0.30 8 0.40 12 My second test Current (Amps) Number of clips 0.00 0 0.10 0 0.20 6 0.30 9 0.40 14 My third test Current (Amps) ...read more.


Probably the reason that some of the results were anomalous was because the voltage used wasn't precisely accurate as the dials on the variable resistance can be misread slightly. Also, some of the paper clip 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 the other results. Generally, my results are confirmed in the book 'Explaining Physics': On page 289 of the book 'Explaining Physics', it says, "Experiments show that, for a solenoid of any given length, the strength of the magnetic field can be increased by increasing the current." Improvements If this experiment were used again, I would try to improve it in the following ways: * Using Iron filings or something that can give me ideal of its weight. * Taking more readings at different voltages. * Using a material for a core, which won't become a permanent magnet when the electricity is turned off. * Taking more readings at higher voltages to try and get to the point of magnetic saturation. ...read more.

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