When planning a test to see the interaction between a magnet and a magnetic object, what is needed to have a fair test?
A. different materials that have the same size and thickness
B. running a trial for each of the materials used
C. running at least 2 trials for each material in different places
D. different magnets that have same sizes and strengths
C. running at least 2 trials for each material in different places
This will help ensure that any variations in results are not due to differences in the testing environment or conditions.