Magnets and Electromagnets

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Presentation transcript:

Magnets and Electromagnets 18/11/2018 Magnets and Electromagnets

Magnetic or non-magnetic? Magnetic or not? 18/11/2018 Material Magnetic or non-magnetic? Conclusion: only certain metals (iron, nickel and cobalt) are magnetic (and anything made from this, like steel)

Magnetic fields 18/11/2018 N S

Attracting and Repelling 18/11/2018

18/11/2018 N S Magnet: Solenoid:

(The poles can be reversed by reversing the direction of the current) Electromagnets 18/11/2018 The strength of an electromagnet can be increased by doing three things: Increasing the voltage Increasing the number of coils Inserting an iron core (The poles can be reversed by reversing the direction of the current)