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Science Investigation: Plan In order to produce an electromagnet you need to have a soft iron core and wire. You need to coil the wire around the iron core and pass a current through the wire to get a magnet. You can vary the strength of this magnet in a number of ways: * Change the number of turns on the coil * Alter the size of the current * Alter the size of the iron core * Change the shape of the iron core * Change the material of the core * Change the ways in which the coils are wrapped around the core * Change the nearby magnetic fields To find out how the electromagnet is affected when the variables above are changed I will take one of the variables and record how the magnet is affected by it's change. I will not change any of the other variables to ensure I'm carrying out a fair test. I have decided...

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