After much study, Oersted realized that his experiments proved that an electric current has a magnetic effect. The needle should be pointing toward the north. Connect your electromagnet and bring it near the compass. After Hans Christian Oersted discovered the relationship between magnetism and electricity, many other scientists began their own experiments to expand on his findings. The electromagnet was one invention that resulted from Oersted's discovery.
Electromagnets are temporary magnets.
A flowing electric current creates a magnetic field. When the electric current is halted, the magnetic field also disappears, so electromagnets can be turned on and off at the flip of a switch. Students may be familiar with the large electromagnets used in recycling centers to separate iron and steel from other scraps. Electromagnets are also found in many ordinary appliances and devices, including doorbells, telephones, telegraphs, fans, loudspeakers and refrigerators. Wind the wire about twenty times in a tight coil around the bolt, leaving about a foot of wire free at either end.