2049_ch29A - PLAN 1. Magnetic field due to a current a...

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PLAN 1. Magnetic field due to a current a differential current-length element i in a long straight wire i in a circular arc of wire 2. Force between two parallel currents
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Electricity vs Magnetism Electricity Magnetism The one law Coulomb’s law Ù Gauss’ law About the force between two point charges. (Dependence of the electric field on the source charge and distance.) Alternatively, about the property of the electric field. No “magnetic charges” (monopoles) have been found. The equation about the force between two small bar magnets turns out to be not fundamental. Everything else is derived from this law, which completely agrees with all observed electrical phenomena. 1. Dependence of the magnetic field on the strength of the source (a current) and distance. Chapter 29 What are fundamental? 2. The force due to a magnetic field. The force on what? Chapter 28
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Magnetic field due to a differential current-length element • Why does “ k*” have such a simple value? Magnetism is inseparable from electricity. Magnetism
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2049_ch29A - PLAN 1. Magnetic field due to a current a...

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