Two students wanted to test the effect of different wire sizes on the strength of a magnet. They used 6 identical nails and wrapped each nail with 6 different sizes of wire. The nails were hooked to 2 D cell batteries to make them electromagnets. The strength of the magnet was tested by the number of paper clips it picked up.
What is the control group?|||There is no control group in the experiment as described.
A control group is used when testing the possibility that one change is significant.
In this case a control group could be created.
We could take several identical nails wrapped with an identical sized wire to establish that the forces do NOT change if we do NOT alter the wire.
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