04_17_Induction_Flux

04_17_Induction_Flux - increasing or decreasing moving ring...

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Today4/17 o Magnetic Induction, Ch 22 o HW: 4/17 “Induced Current” Due Thursday, 4/24 o Friday and Monday are holidays! o Exam 4/24 o Force and motion of charged particles o B-fields due to wires o Forces from currents (like 4/16 Wires 2) o Induced current (like 4/17)

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Magnetic Induction We need a model for the jumping ring There is no battery to push current around the ring as was the case in all examples so far. (See 4/10 and 4/11 HW) Major Question: What pushes current around the loop????
moving ring Magnetic Induction First clue comes from this example: S N Use RHR #1

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Magnetic Induction S N moving magnet Same current as when ring moves!
Magnetic Induction Same current as when ring moves! What if I make the magnet appear suddenly? S N

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Careful!!!! o The current only flows while: o the B-field is changing o the ring is moving o the magnet is moving o It’s all about a “changing” B field!!! o Look at whether the # of field lines are

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Unformatted text preview: increasing or decreasing moving ring Magnetic Induction First clue comes from this example: S N Field lines point left and are increasing Magnetic Induction S N moving magnet Field lines point left and are increasing Magnetic Induction S N Field lines point left and are increasing The Minus sign (again!) o The current in the loop will flow so as to oppose the change in the # of lines. moving ring Magnetic Induction Change points left- loop fights it right-current as shown. S N Field lines point left and are increasing Magnetic Induction S N moving magnet Field lines point left and are increasing Change points left- loop fights it right-current as shown. Magnetic Induction S N Field lines point left and are increasing Change points left- loop fights it right-current as shown....
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This note was uploaded on 12/21/2010 for the course PHYS Physics 21 taught by Professor Larrywatson during the Spring '08 term at North Dakota.

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04_17_Induction_Flux - increasing or decreasing moving ring...

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