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Transcript
22.5 Lenz’s Law
LENZ’S LAW
The induced emf resulting from a changing magnetic flux has a
polarity that leads to an induced current whose direction is such
that the induced magnetic field opposes the original flux change.
Reasoning Strategy
1. Determine whether the magnetic flux that penetrates the coil
is increasing or decreasing.
2. Find what the direction of the induced magnetic field must be
so that it can oppose the change influx by adding or subtracting
from the original field.
3. Use RHR-2 to determine the direction of the induced current.