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lecture21 - Biot-Savart Law Ampres Law lds s nt s Fie and...

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Biot-Savart Law, Ampère’s Law Fields and forces for current in straight wires Ampère’s Law

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Example 1: Long parallel wires Example 1: Long parallel wires Find forceon current I 1 in segment ab due to current I 2 (magnitude& direction) L I 1 d (TakeI 1 = 20A, I 2 =30A, d=0.01m, L=1.5m) a b I 2
Solution

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Quiz Quiz I 1 I 2 Thetwo long wires shown cross at right angles. The horizontal wire1 is fixed. How will the red wiremove when the currents are turned on? A) Left B) Right C) Rotateclockwise D) Rotatecounter-clockwise E) It won’t move
For any closed path : Ampère’s Law (an integral theorem) Thecurrent flows through the surface bordered by thepath. direction of integration determines positive current direction Positivecurrent is out of the page through theshaded surface (right hand rule) encircled net o path I s d B , μ =

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Calculating B from Ampere’s Law For a few simple shapes, wecan calculatethefield B easily from Ampere’s Law. Thesteps: i) use symmetry to choosean appropriatepath ii) determine the direction of B from RHR.
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lecture21 - Biot-Savart Law Ampres Law lds s nt s Fie and...

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