# 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 force on current I 1 in segment ab due to current I 2 L I 1 d 1 2 a b I 2
Solution

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Quiz Quiz I 1 I 2 The two long wires shown cross at right angles. The horizontal wire 1 is fixed. How will the red wire move when the currents are turned on? A) Left B) Right C) Rotate clockwise D) Rotate counter-clockwise E) It won’t move
For any closed path : Ampère’s Law (an integral theorem) The current flows through the surface bordered by the path. direction of integration determines positive current direction Positive current is out of the page through the shaded 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, we can calculate the field B easily from Ampere’s Law. The steps: i) use symmetry to choose an appropriate path
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## This note was uploaded on 03/16/2011 for the course PHYSIC 1e03 taught by Professor Dr.oak during the Spring '10 term at McMaster University.

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

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