PHYS 272 Lecture Notes - Lecture 34: Net ForcePremium
3 pages28 viewsSpring 2018
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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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