23 Induction

23 Induction - Craig Ogilvie Craig Ogilvie 11 Summary of...

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Unformatted text preview: Craig Ogilvie Craig Ogilvie 11 Summary of Lecture 22 Direction of induced emf (Lenzs Law) induced current in direction of red arrows opposes change in flux in this case, tries to increase B-field within loop B-field from induced current same direction as existing B C B out of page, decreasing in strength with time =>magnetic flux changes with time induces emf around loop = - = A d B emf dt d B B Faradays law Craig Ogilvie Craig Ogilvie 22 Goals For Today There must be a force to accelerate charges in conductor, or else no current Force is either electric or magnetic Craig Ogilvie Craig Ogilvie 33 Forces Flux decreasing with time => current There must be a force that is accelerating electrons => current Must be an E-field that is accelerating electrons v moving, not is ring since , = = = B v q F B d Craig Ogilvie Craig Ogilvie 44 Faradays Law (Continued) Change in magnetic flux induces an E-field ( 29 - =- = s d E emf A d B dt d Calculate E-field by the work it does on charges q F E s d E q s d F q Work emf / since , = = = = If&B changes with time induces curly E-field, & E Faradays Law E Craig Ogilvie Craig Ogilvie 55 Faradays Law Links E/B fields q generates E-field...
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This note was uploaded on 09/20/2011 for the course PHYS 222 taught by Professor Johnson during the Spring '07 term at Iowa State.

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23 Induction - Craig Ogilvie Craig Ogilvie 11 Summary of...

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