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# lecture22 - More Examples of Biot-Savart Ampres Law Recall...

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More Examples of Biot-Savart & 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
Quiz: Quiz: A light, loosespiral spring carrying no current is hung froma ceiling. When a switch is closed so that a circuit exists in thespring, do thecoils: a) movefarther apart b) movecloser together c) do not moveat all

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Example 1: Example 1: A very long straight wirecarries current I. In themiddle of the wirea right-anglebend is made. Thebend forms an arc of a circle of radius r, as shown below. Determine the magnetic field at thecenter of thearc.
Solution

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Example 2: Example 2: A closed current path shaped as shown below produces a magnetic field at P. If thearc subtends an angle of 30 0 and thetotal length of the wireis 1.2m, what arethemagnitude and direction of the field produced at P if the

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