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Section 2 – Magnetism from Electricity p.48 A.) The Discovery of Electromagnetism p.48 1.) Electromagnetism – the interaction between electricity & magnetism 2.) Hans Christian Oersted discovered electromagnetism a.) discovered that an electric current produces a magnetic field B.) Using Electromagnetism p.49 1.) Two devices that strengthen the magnetic field are the solenoid & the electromagnet. 2.) Solenoid – a coil of wire with an electric current in it. 3.) Two ways to strengthen the solenoid’s magnetic field: a.) increase the electric current in the wire b.) increase the number of loops per meter in the coil 4.) Electromagnet – a coil that has an iron core & acts as a magnet when an electric current is in the coil