lecture21 - The Biot The Biot-Savart Law Savart Law (Text...

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Unformatted text preview: The Biot The Biot-Savart Law Savart Law (Text section 30.1) Practice: Chapter 30, problems 1, 3, 5, 7, 9. Sources of B Sources of B B exerts a force on moving charges. But also, moving charges create magnetic fields. Two equivalent ways of calculating B produced by currents: i) Biot-Savart Law: Field of a current element ( analagous to a point charge in electrostatics). ii) Ampres Law: An integral theorem. I ds Biot and Savart: each current element I ds (a very short length ds of wire, carrying current I) produces a field dB throughout space: In reality, the current element is part of a complete circuit, and only the total field due to the entire circuit can be observed. dB Biot Biot-Savart Law Savart Law I I sin iv) 1 iii) ii) current i) 2 dB dB r dB dB r (out of page) ds r r dB Field produced at a vector distance r by a current element I ds : m/A T 10 4 7 o = 4 2 o r I r ds dB = We get the total B by integrating along the wire...
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lecture21 - The Biot The Biot-Savart Law Savart Law (Text...

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