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lecture18 - 1 Physics 2102 Gabriela González B = μ in B z...

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Unformatted text preview: 1 Physics 2102 Gabriela González B = μ in B ( z ) ≈ μ 2 π μ z 3 μ =N i A An electrical current produces a magnetic field. 2 dA A magnetic field can create a en electrical current too! If we define magnetic flux, similar to definition of electric flux, but for an open surface with an edge: B n • Take note of the MINUS sign!! • The induced EMF acts in such a way that it OPPOSES the change in magnetic flux (“Lenz’s Law”). Then a time varying magnetic FLUX creates an induced EMF, and thus an electrical current if the edge is a wire!: • When the N pole approaches the loop, the flux “into” the loop (“downwards”) increases • The loop can “oppose” this change if a current were to flow clockwise, hence creating a magnetic flux “upwards.” • So, the induced EMF is in a direction that makes a current flow clockwise. • If the N pole moves AWAY, the flux “downwards” DECREASES, so the loop has a counter clockwise current! 3 • A closed loop of wire encloses an...
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This note was uploaded on 05/20/2011 for the course PHYS 2102 taught by Professor Gimmnaco during the Fall '08 term at LSU.

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lecture18 - 1 Physics 2102 Gabriela González B = μ in B z...

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