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I have done an experiment where a magnet was dropped through a coil of wire and the induced emf was recorded.

Graph to show faradys law

My understanding is that the area's under the positive and negative sections of the graph should be equal as they represent the change in magnetic flux by Faraday's law and the only change in magnetic flux is caused by the magnet which is constant.

However according to both my data (and a friends) they are not equal.

The graph bellow shows the result of applying Simpsons rule to a range of graphs varying the height from which the magnet was dropped.The total area under this graph is consistently negative showing that the area's under the peaks are not equal and the area under the second peak is larger.

Also there appears to be a trend for the difference in the area's to decrease as the magnet is dropped from increasing heights.

Total area under graph

I would like to know is this is meant to be the case (and if so why) or if there is an error in my experiment and the data is just rubbish.

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