# lecture21 - Biot-Savar t Law Ampèr e’s Law • Fields...

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Unformatted text preview: Biot-Savar t Law, Ampèr e’s Law • Fields and forces for current in straight wires • Ampère’s Law Example 1: Long par allel wir es Example 1: Long par allel wir es Find force on current I 1 in segment ab due to cur r ent I 2 (magnitude & direction) L I 1 d 1 2 a b I 2 Solution 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? For any closed path : Ampèr e’s Law (an integr al theor em) The current flows thr ough the sur face 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 ∫ = • 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 ii) determine the direction of B from RHR....
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lecture21 - Biot-Savar t Law Ampèr e’s Law • Fields...

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