Presentation on theme: "1.A magnet can attract magnetic material (e.g. iron, steel, cobalt or nickel) or another magnet placed near it 2.There is a magnetic field around a magnet."— Presentation transcript:
1.A magnet can attract magnetic material (e.g. iron, steel, cobalt or nickel) or another magnet placed near it 2.There is a magnetic field around a magnet 3.Like poles repel (north/north) 4.Opposite poles attract (north/south) Magnets Magnets
1.When an electric current flows through a coil of wire there is a magnetic field around the wire. One end of the coil becomes a north-seeking pole and the other end becomes a south-seeking pole. This is called an electromagnet. 2.Reversing the current in an electromagnet reverses the poles of the electromagnet. 3.Electromagnets are used in simple motors and circuit breakers Electromagnets Electromagnets
1.When a wire carrying an electric current is placed in a magnetic field it experiences a force. The size of the force increases with; a)increasing strength of the magnetic field b)increasing current 2.The direction of the force can be reversed by changing the direction of the current or the magnetic field Electric Motors
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