an electromagnet is made of coiled wires, iron core, and source of electricity
am_signal is electro_magnetic_ibt. elastance_unit is electromagnetic_unit. magnetic_head is electromagnet. electromagnetism is magnetism. electrostatic_generator is electrical_device. electromagnet is magnet. electromyograph is electrical_device. electromagnetism is physics. electro_magnetic_ibt is information_bearing_wave_propagation. copper is electrical_conductor.