# lecture21 - Biot-Savart Law Ampres Law AmpresLaw Example 1...

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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 (Take I 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 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
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lecture21 - Biot-Savart Law Ampres Law AmpresLaw Example 1...

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