Hello fellow people. i am about to make some copper coils to use to create electrcity when i pass my magnets. i am new to this are of work and this is a home project for myself, any information would help greatly, and also some links to youtube videos that are very clear o understand as im not the 'quick' with things i dont understand. so.... i am using 25mm x 10mm x 3mm (lengh/width/depth) neodymuim magnets, rectangular shape, and im using 2mm insulated copper wire. i have purchased 30 of these magnets and am planning to stack them in sets of 4, and have six sets, and idealy make six coils for the magnets to pass, the coils being stationary and the magnets on a peice of wood that rotates via a pully. what size should i make my coils? i understand my coils inside diamiter should be the same size as the longest part of my magnet, ie;25mm, but how wide should my coil be? thats the bit that eludes me, i have added a picture to try help my explanation if this helps, thanks in advance for any information that you can give.