magnetic material, A material, such as iron, that is attracted to a magnet., permanent magnet, A magnet that is always magnetic, such as a bar magnet., induced magnet, A piece of material that becomes a magnet because it is in the magnetic field of another magnet, such as a compass needle., temporary magnet, A magnet that is not always magnetic, such as an electromagnet or an induced magnet., magnetic field, The area around a magnet where it can affect magnetic materials or induce a current., plotting compass, A small compass used to find the shape of a magnetic field., electromagnet, A magnet made using a coil of wire with electricity flowing through it., solenoid, A coil of wire with electricity flowing in it. Also called an electromagnet., motor effect, The force experienced by a wire carrying a current that is placed in a magnetic field., Fleming's left-hand rule, A way of remembering the direction of the force when a current flows in a magnetic field. Thumb = F; Index finger = B; Middle finger = I, magnetic flux density, A way of describing the strength of a magnetic field. It is measured in Tesla’s (T)., tesla (T), The unit for magnetic flux density, also given as newtons per ampere metre (N/A m)., split-ring commutator, A device attached to the rotating coil of a motor that makes contact with an external circuit. It switches over the connections every half turn., carbon brush, A block of carbon that makes electrical contact between a circuit and a moving object such as a slip ring or commutator..

Magnetic Fields

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