Electromagnetism Electromagnetism Describes the magnetic field produced by

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Electromagnetism

Electromagnetism

Electromagnetism • • • Describes the magnetic field produced by a current-carrying wire (righthand

Electromagnetism • • • Describes the magnetic field produced by a current-carrying wire (righthand rule or left-hand rule) Names ways of modifying the intensity of the magnetic field produced by a current-carrying wire (type of wire, current intensity) Compares the behaviour of a compass in the magnetic field of a magnet with the magnetic field created by a current-carrying wire Describes the magnetic field produced by a solenoid (right-hand rule or left-hand rule) Names ways of changing the intensity of the magnetic field produced by a solenoid (nature of the core, intensity of the current, number of turns) Names ways of inducing electrical current in a wire (e. g. movement of a magnet, changing the intensity of a magnetic field)

Electromagnetism • How do magnets react? • Right hand rule – (straight wire and

Electromagnetism • How do magnets react? • Right hand rule – (straight wire and solenoid) • Increase magnetic field – (straight wire and solenoid) • How to generate electricity?

Recap on Magnetism • Magnetism: – All phenomena caused by magnets • A magnet

Recap on Magnetism • Magnetism: – All phenomena caused by magnets • A magnet is an object that can attract other objects containing iron, cobalt or nickel

Magnetism • Have you ever noticed? – It doesn’t matter which part of the

Magnetism • Have you ever noticed? – It doesn’t matter which part of the magnet you bring to iron, it will always attract to a magnet. – Why? • Iron is made up of small polarized regions called domains. Each of these act like a small magnet. When you magnetize the iron, the domains align to be attracted to the magnet. Remember opposites attract

 • *** IRON, COBALT, NICKEL

• *** IRON, COBALT, NICKEL

Magnetism • Attraction and Repulsion – Opposites attract – Like poles repel

Magnetism • Attraction and Repulsion – Opposites attract – Like poles repel

Electromagnetism • Electromagnetism: – All phenomena resulting from the interaction between electricity and magnetism.

Electromagnetism • Electromagnetism: – All phenomena resulting from the interaction between electricity and magnetism. – Right Hand rules: • Live Wire – Thumb points to the negative terminal – Fingers show the direction of the magnetic field

Electromagnetism • Right Hand rule – Solenoids (a cylindrical coil of live wire) •

Electromagnetism • Right Hand rule – Solenoids (a cylindrical coil of live wire) • You fingers follow the coil and point towards the negative terminal • Your thumb indicates the magnetic North

Electromagnetism • How can you tell what is the negative terminal? – In the

Electromagnetism • How can you tell what is the negative terminal? – In the circuit drawings the negative terminal will either be identified with a – Or… – In the following symbol the shorter terminal is the negative one

Electromagnetism • You can generate an electrical field by… – Moving a conductor in

Electromagnetism • You can generate an electrical field by… – Moving a conductor in a magnetic field – Moving a magnet around a conductor

 • Magnetic field of a life wire – The thumb points in the

• Magnetic field of a life wire – The thumb points in the direction of conventional current – The fingers show the direction of the magnetic lines

 • Will the magnetic field be clockwise or counter clock wise

• Will the magnetic field be clockwise or counter clock wise

 • What are the two poles?

• What are the two poles?