If you have 2 coils. No.1 coil 40 gauge copper wire with a resistance 1049 ohms, 100 feet. No.2 coil you have 5 gauge wire. to get the same resistance you must now use about 3,348,000 feet for wire. Both coils you will pull .095 amps at 100 volts dc. Coil 1 will have a weak magnetic field of .012 Gauss. Coil 2 will have a strong magnetic field of about 23.7 Gauss. That's why I say the current is the catalyst. More wire stronger magnetic field.