Electro magnet lifts a lot of iron screws, but the magnet will only be able to do so as long as the current flows in the coils.

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Keywords: attraction, classic, coil, current, demonstration, density, education, educative, electricity, electro, electromagnet, electromechanics, electrons, experiment, field, flux, force, gauss, hand, human, iron, isolated, learning, lift, magnetic, magnetism, motoric, physics, polarized, school, science, screws, solenoid, study