Investagate the strength of an electromagnet

... Aim The aim of the experiment is to investagate the strength of an electromagnet Introduction An electromagnet is a coil of wire wound on a soft iron core. Unlike refrigerator or bar magnets, electromagnets use electricity to generate a magnetic field. In addition, electromagnets give us the ability to turn the magnetic field on or off as we need. To make an electromagnet, you need electricity (usually supplied by a battery or a larger power source) and something for that electricity to flow through (wire coils, for example). Sometimes, the wire of an electromagnet is wound around a metal rod to increase the magnetic field strength. The electromagnet was discovered in 1820 by a man named Oersted.He accidentally discovered that a wire with electricity running though it made a compass deflect from the Earth's North Pole. In fact, the compass needle was perpendicular to the direction of the electric flow. That meant that

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