Notes on Chapter 28

Notes on Chapter 28 - Chapter 28 -Magnetic Fields 28-1 What...

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1 July 2010 1 Chapter 28 -Magnetic Fields Applications of magnetic fields and magnetic forces are countless: Magnetic recording of music and video images Control of CD and DVD players and computer hard drives Drive for speaker cones in headphones, TV’s, computers, and telephones Security alarm systems, doorbells, and automatic door latches Etc 28-1 What is Physics?

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1 July 2010 2 What Produces a Magnetic Field? Electric fields are caused by electric charges Magnetic fields are caused by [ ????? ] There are no magnetic charges (or magnetic monopoles ) Two ways of producing magnetic fields are shown below: Bar magnet Electromagnet The earth is a huge bar magnet 28-2
1 July 2010 3 The Definition of B Electric Field: E F E q = Magnetic Field | : | x | | sin B B B F B qv F qv B F q vB φ = = =  Defined in terms of the electric force on a test charged particle at rest Defined in terms of the magnetic force exerted on a moving charged test particle 28-3

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1 July 2010 4 Magnetic Force on a Charged Particle Right-hand Rule positive q negative q The force acting on a charged particle moving with velocity through a magnetic field is always perpendicular to and B F v B v B
1 July 2010 5 Motion of three charged particles in a magnetic field directed out of the plane of the figure ee γ −+ = +

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This note was uploaded on 09/30/2010 for the course PHYS MTH 203 taught by Professor None during the Spring '10 term at American University of Sharjah.

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Notes on Chapter 28 - Chapter 28 -Magnetic Fields 28-1 What...

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