Lecture 20 preview mar20

Lecture 20 preview mar20 - Lecture 20: Inductance M and L...

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Lecture 20: Inductance M and L Begin Ch 30 today Next Tuesday: RL, LC, LRC circuits Next Thursday: begin AC circuits (Ch. 31)
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Mutual Inductance changing i 1 1 21 2 21 21 2 1 21 1 2 21 21 1 21 2 21 2 2 : , : i N M giving dt d N dt di M have also we but dt di M definition l operationa M dt di M and dt d N induced Φ = Φ = - = - = Φ - = ξ Induced ξ 2 Current changing in coil 1 produces a changing B field and hence changing flux Φ 21 through coil 2. By Faraday’s law there is an induced emf ξ 2 in coil 2 at/thru 2 due to 1 DEMO Ф 21
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How does M 12 relate to M 21 ? (change current in coil 2 and measure induced ξ 1 ) ) ! ... ?? ( between) nce ze2)(dista (size1)(si ize2)] between)(s stance (size1)(di [ 12 21 2 1 21 1 1 1 2 1 21 2 21 true and plausible M M N N M i i N N i N M = = = Φ = Thus we can drop subscripts on M 2 12 1 1 21 2 2 1 1 2 : i N i N M or dt di dt di M Φ = Φ = - = - = ξ Units of inductance: Henry, H H = Tm 2 /A = Wb/A
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Joseph Henry (American, 1797-1878) Joseph Henry (1797-1878) is widely considered the foremost American scientist of the 19th century. Although Henry at an early age appeared to be headed for a career in the theater, a chance encounter with a book of lectures on scientific topics turned his interest to science. Henry's early
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This note was uploaded on 04/04/2008 for the course PHYSICS 240 taught by Professor Davewinn during the Spring '08 term at University of Michigan.

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Lecture 20 preview mar20 - Lecture 20: Inductance M and L...

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