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2 cards from this section. Quick, good the night before a test.
What is induced emf?
Think about how magnetic fields can cause current.
State Lenz's Law.
Remember it ensures energy conservation.
What happens when magnetic flux linked to a circuit changes?
Remember the definition of induced emf.
Lenz's law explains the direction of induced current.
Think about prevention in nature.
A coil with an area of 0.1 m² and a magnetic field strength of 0.5 T is subjected to a changing magnetic field that increases by 0.1 T in 0.5 seconds. What is the induced emf?
First calculate the magnetic flux change.
If a coil stores 0.5 J of energy and has an inductance of 2 H, what is the current flowing through the coil?
Use the energy storage formula to find current.
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