Magnets and Electromagnets 01/12/2018 Magnets and Electromagnets

Magnetic or non-magnetic? Magnetic or not? 01/12/2018 Material Magnetic or non-magnetic? Conclusion: only certain metals (iron, nickel and cobalt) are magnetic (and anything made from this, like steel)

Magnetic fields 01/12/2018 N S

Attracting and Repelling 01/12/2018

01/12/2018 N S Magnet: Solenoid:

(The poles can be reversed by reversing the direction of the current) Electromagnets 01/12/2018 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)

Examples of electromagnets 01/12/2018 2. Relay switch 1. Speaker

Uses of electromagnets 2 - An electric bell 01/12/2018 Uses of electromagnets 2 - An electric bell