Lecture%2021%202220%20Spring%202009 - Reminders and...

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1 Reminders and Announcements Homework 13 is due Friday; HW 14 will be due the Tuesday after spring break I have unreturned exams Help Room Hours (Physics 117): M 4-8 pm, T 3-6:30, W 3-6:30, R 4:30-8, F 2-6 Ampere’s Law Start with the magnetic field around a current- carrying wire Ampere’s Law Integrate B along a closed circular path around the wire Ampere’s law states that the line integral of B . d s around any closed path equals m o I where I is the total steady current passing through any surface bounded by the closed path. s I o d μ  B Ampere’s Law, cont. • Ampere’s law describes the creation of magnetic fields by all continuous current configurations Most useful for this course if the current configuration has a high degree of symmetry Put the thumb of your right hand in the direction of the current through the amperian loop and your fingers curl in the direction you should integrate around the loop Rank the magnitudes of B · d s for the closed paths in the figure below, from least to greatest. 1 2 3 4 5 20% 20% 20% 20% 20% 0 of 126 1) a, b, c, d 2) b, d, a, c 3) c, d, b, a 4) c, b, a, d 5) d, c, a, b Field Due to a Long Straight Wire – From Ampere’s Law
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2 Field Due to a Long Straight Wire Results From Ampere’s Law Outside of the wire, r > R
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Lecture%2021%202220%20Spring%202009 - Reminders and...

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