Lec18 - Lecture 18 Lecture 18-1 Motional EMF of Sliding...

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Unformatted text preview: Lecture 18 Lecture 18-1 Motional EMF of Sliding Conductor h Lenzs Law gives direction Induced EMF: counter-clockwise h Faradays Law B d dx Bl Blv dt dt = = = h This EMF induces current I Blv I R R = = h Magnetic force F M acts on this I 22 M Blv F IlB R = = h F M decelerates the bar 22 dv Blv m dt R = 22 dv Bl dt v mR = () 22 () Bl t mR vt v e = Lecture 18 Lecture 18-2 Ways to Change Magnetic Flux Changing the magnitude of the field within a conducting loop (or coil). Changing the area of the loop (or coil) that lies within the magnetic field. Changing the relative orientation of the field and the loop . motor generator cos B BA = Lecture 18 Lecture 18-3 Eddy Current The presence of eddy current in the object results in dissipation of electric energy that is derived from mechanical motion of the object. The dissipation of electric energy in turn causes the loss of mechanical energy of the object, i.e., the presence of the field damps motion of the object. A current induced in a solid conducting object, due to motion of the object in an external magnetic field. Lecture 18...
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Lec18 - Lecture 18 Lecture 18-1 Motional EMF of Sliding...

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