Hello everyone and thank you for your replies in advance. I am currently doing a physics project where I am testing to see how the number of coils of wire effects the current generated when a magnet is run through the coil. I am currently just dropping the magnet through the coil from a constant height (the coils are around a paper towel tube) but I am finding it difficult to get consistent readings. Based on the readings I have gotten, doubling the number of coils (one tube has 100 coils and the other has 100 coils and 100 more on top of those) does not double the current produced. I assume this is because the wire has greater resistance since it is much longer. I am just wondering if these are the results I should be getting, or have I completely messed up? Thank you again for all your replies.