# Lect15 - Physics 212 Lecture 15 Amperes Law B d = o I...

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Physics 212 Lecture 15, Slide 1 Physics 212 Lecture 15 Ampere’s Law = enclosed o I d B μ l a a

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Music Who is the Artist? A) Robert Plant B) Lyle Lovett C) Alison Krauss D) Mark Knopfler E) John Prine Mark Knopfler, OBE Dire Straits to country We had a request … How old is he? Physics 212 Lecture 15
“I actually understand this. Something must be wrong. ..” “I don't understand how you can tell the direction of the magnetic field from a picture. ” Still some trouble with directions in office hours – will review quickly Physics 212 Lecture 15, Slide 3 Your Comments 05 Calculate field in solenoid; compare to infinite sheet Example today Hour Exam II – Wed. Oct. 26 “Can we go over the second checkpoint? The second question was not covered in the prelecture.” “I dont quite get the use of 'n' in the formula for magnetic field from an infinite plane. like if we are solving a problem you will not tell as that this infinite plane contains these many infinitely long current carrying wires will you?” “What does the integral of bdl find you?” “I AMPEREful of not understanding the content of this past pre-lecture.”

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B Fields and Forces Check What are the directions of the field and the force due to I 3 at I 1 ? Physics 212 Lecture 15, Slide 4 B F F B F B F B F B A. B. C. D. E. What are the magnitudes of the field and the force due to I 3 at I 1 ? 0 3 1 31 1 1 , 2 I B F I LB d μ π = = 0 1 1 31 3 1 , 2 I B F I LB d = = 0 3 1 31 3 1 , 2 I B F I LB d = = B. C. A. B 1 due to I 3 ; F on I 1
Physics 212 Lecture 15, Slide 5 :05 Infinite current-carrying wire R I B o π μ 2 = R B d B Bd d B 2 = = = l l l a a LHS: I I enclosed = RHS: General Case

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## This note was uploaded on 03/12/2012 for the course PHYS 212 taught by Professor Kim during the Fall '08 term at University of Illinois, Urbana Champaign.

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Lect15 - Physics 212 Lecture 15 Amperes Law B d = o I...

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