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lecture19 - Physics 2102 Gabriela Gonzlez A magnetic field...

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Physics 2102 Gabriela González
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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!:
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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!
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A non-magnetic (e.g. copper, aluminum) ring is placed near a solenoid.
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