lecture18 - Physics 2102 Jonathan Dowling Physics 2102...

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Physics 2102 Physics 2102 Lecture 18 Lecture 18 Ch30: Ch30: Physics 2102 Jonathan Dowling Nikolai Tesla
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dA Faraday’s Law Faraday’s Law A time varying magnetic FLUX creates an induced EMF Definition of magnetic flux is similar to definition of electric flux B n dt d EMF B Φ - = B S B dA Φ = × r r 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”).
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dA Another formulation of Another formulation of Faraday’s Law Faraday’s Law We saw that a time varying magnetic FLUX creates an induced EMF in a wire, exhibited as a current. Recall that a current flows in a conductor because of the forces on charges produced by an electric field . Hence, a time varying magnetic flux must induce an ELECTRIC FIELD ! But the electric field line would be closed!!?? What about electric potential difference V=∫E•ds? B
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lecture18 - Physics 2102 Jonathan Dowling Physics 2102...

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