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Lenz's Law

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by

Richard Datwyler

on 14 March 2016

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Transcript of Lenz's Law

Lenz's Law
Lenz's Law dictates the direction.
Faraday's Law dictates the magnitude of the current that is created by changing the magnetic field through a ring.
6 options
B down
B down
B down
B up
B up
B up
CCW current
CCW current
CW current
CW current
Alternatively:

The magnetic field generated by the current will point in opposite direction of B field.
If increasing
Take the direction of the magnetic field.
Is the flux increasing or decreasing?
If decreasing
The magnetic field generated by the current will point in same direction of B field.
For current, use RHR.
A ring is being pulled out of a region of magnetic field that is pointing into the screen. Which way is the induced current?
B in
B in
decreasing flux
B in
induced
CW current
No change
Increase
Decrease
No change
Increase
Decrease
No current
No current
Full transcript