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Magnets and Electromagnets • Magnets exert forces at a distance on magnetic materials like iron and steel • Magnets pull and push other magnets N-N repel S-S repel N-S attract • A coil of wire carrying a current is called an electromagnet • It makes a magnetic field just like a bar magnet which is stronger at the ends • Reversing the current reverses the poles at the ends Electromagnets The strength of the electromagnet can be increased by: • More turns of the coil • Using an iron core • Increasing the size of the current The Circuit Breaker Explain how the circuit breaker works by arranging the statements in the correct order. Extra: The Electric Bell Uses of Electromagnets • • • • • In scrap yards and factories Electric buzzers Electric bells Relay switches Circuit breakers
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