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Lecture 34

PHYS 272 Lecture 34: Lenz’s Law
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3 Pages
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Spring 2018

Department
Physics
Course Code
PHYS 272
Professor
Kaustubh Agashe
Lecture
34

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LECTURE APRIL 19 (THURSDAY)
Lenz’s Law says that induced current is clockwise so that B created by current is into the
plane, opposing the growing flux out of the plane from external field, that induces current.
    
  
The power is supplied by whoever moves the rod
But velocity is constant, hence net force = 0
There is an opposing force
   

 
  
Don’t use Faraday’s Law
Free electrons moving right with velocity v
Force on electrons upward (v x B)q
Electrons move anti-clockwise, hence Current is Clockwise
EMF = Work done per unit charge = Force due to B on electrons
  
  
 
Generalized version of Faradays Law
Coil is stationary, but magnet is moving
Magnetic field changes, hence EMF induced
E = Work done per unit charge



The EMF exists even if there is no conducting path for current to flow

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Description
LECTURE APRIL 19 (THURSDAY) Lenzs Law says that induced current is clockwise so that B created by current is into the plane, opposing the growing flux out of the plane from external field, that induces current. = = ( ) = ) The power is supplied by whoever moves the rod But velocity is constant, hence net force = 0 There is an opposing force = = [ ] = = Dont use Faradays Law Free electrons moving right with velocity v Force on electrons upward (v x B)q Electrons move anticlockwise, hence Current is Clockwise EMF = Work done per unit charge = Force due to B on electrons = = = Generalized version of Faradays Law Coil is stationary, but magnet is moving Magnetic field changes, hence EMF induced E = Work done per unit charge = The EMF exists even if there is no conducting path for current to flow
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