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What are the differences between Faraday's Law and Lenz's Law?
Faraday's Law: Quantifies the induced EMF based on the rate of change of magnetic flux. | Lenz's Law: Determines the direction of the induced EMF, opposing the change in flux.
Compare voltage step-up and step-down in transformers.
Step-Up: More loops on the secondary side, increases voltage. | Step-Down: More loops on the primary side, decreases voltage.
What are three ways to change magnetic flux?
1. Changing the magnetic field strength (B). 2. Changing the area (A) of the loop in the field. 3. Changing the angle (θ) between the field and area.
Describe how a motional EMF flashlight works.
A metal bar moves, sweeping area A = lΔx. The increasing area increases magnetic flux (ΦB = ∫ B ⋅ dA = BA). The induced field opposes this. Using RHR #2, the current flows CCW.
What is the effect of increasing the number of loops in the secondary coil of a transformer?
The output voltage increases (voltage step-up).
What is the effect of moving a magnet towards a conducting loop?
A current is induced in the loop, creating a magnetic field that opposes the motion of the magnet.
What happens when a conducting rod moves through a magnetic field?
A motional EMF is induced in the rod, given by \(ε = Blv\).
What is the effect of increasing the velocity of a conducting rod moving through a magnetic field?
The induced EMF increases, leading to a larger induced current if the circuit is closed.
What is the effect of increasing the magnetic field strength on a moving conductor?
The induced EMF increases, leading to a larger induced current and force.