lecture22 - More Examples of Biot-Savart & Ampres Law...

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More Examples of Ampère’s Law
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Recall: Biot-Savart Law: Ampere’s Law: 2 4 ˆ I o μ d π r × = s r B = I d o μ s B
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Quiz: Quiz: A light, loose spiral spring carrying no current is hung from a  ceiling.  When a switch is closed so that a circuit exists in the spring, do  the coils: a) move farther apart b) move closer together c) do not move at all
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Example 1: Example 1: A very long straight wire carries current I. In the middle of the  wire a right-angle bend is made. The bend forms an arc of a circle of radius r, as  shown below. Determine the magnetic field at the center of the arc.
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Solution
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Example 2: Example 2: A closed current path shaped as shown below  produces a  magnetic field at P.  If the arc subtends an angle of 30 0  and the total length of the  wire is 1.2m, what are the magnitude and direction of the field produced at P if the 
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lecture22 - More Examples of Biot-Savart & Ampres Law...

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