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Prozorov_10 - PHYSICS 222 Introduction to Classical Physics...

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PHYSICS 222 Introduction to Classical Physics II Prof. Ruslan Prozorov Iowa State University Fall 2011 LECTURE 10 Magnetic field Sources of magnetic field Magnetic forces
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magnetism Here you see an MRI scans. The magnetic field interacts with molecules in the body to orient spin before radio frequencies are used to make the spectroscopic map. The different shades are a result of the range of responses from different types of tissue in the body. o Magnets exert forces on each other just like charges. In fact, you can draw magnetic field lines just like you drew electric field lines. o We will soon discover is that electrostatics, electrodynamics, and magnetism are deeply interwoven. 14 September 2011 PHYS222 - Lecture 10 - Prof. Ruslan Prozorov - Iowa State University 2
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Magnetic north and south poles’ behavior is not unlike electric charges. For magnets, like poles repel and opposite poles attract. 14 September 2011 PHYS222 - Lecture 10 - Prof. Ruslan Prozorov - Iowa State University 3
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magnetism and (some) metals A permanent magnet will attract a metal like iron, cobalt, nickel with either the north or south pole. Other metals, like aluminum, gold, copper, silver are not attracted. 14 September 2011 PHYS222 - Lecture 10 - Prof. Ruslan Prozorov - Iowa State University 4
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magnetism of our planet 14 September 2011 PHYS222 - Lecture 10 - Prof. Ruslan Prozorov - Iowa State University 5
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how compasses work 14 September 2011 PHYS222 - Lecture 10 - Prof. Ruslan Prozorov - Iowa State University 6
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magnetosphere shield 14 September 2011 PHYS222 - Lecture 10 - Prof. Ruslan Prozorov - Iowa State University 7
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magnetic field variation 14 September 2011 PHYS222 - Lecture 10 - Prof. Ruslan Prozorov - Iowa State University 8
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units of magnetic field - magnetic field strength: [A/m] - magnetic induction: [T] (Tesla) in the simplest case: magnetic permeability of free space - relative magnetic permeability 14 September 2011 PHYS222 - Lecture 10 - Prof. Ruslan Prozorov - Iowa State University 9 0  B H 7 2 0 4 10 / N A 0   H B
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