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I have uploaded an experiment video on electric generation by moving magnets through a coil.//www.youtube.com/watch?v=MyrpcjIJ3kwLet us know if the result agrees with your expectation.
The explanation of Hamdani’s experiment is pretty simple. The magnetic field is strong only at the ends of the magnet, that is, at its poles. Along the length of the magnet the field is very weak. That’s why there is no current induced in the coil when the pretty long magnet is moving inside the coil.