All Flashcards
What is Magnetic Flux (Φ)?
The amount of magnetic field passing through a given area.
What is Faraday's Law?
A changing magnetic flux through a loop of wire induces an electromotive force (emf).
What is Lenz's Law?
The induced emf always creates a current that produces a magnetic field opposing the change in the magnetic flux that caused it.
Define induced EMF.
The electromotive force generated in a circuit due to a changing magnetic field.
What is an area vector?
A vector perpendicular to the surface, pointing outward from a closed surface.
Define induced current.
The current that flows in a circuit due to an induced EMF, opposing the change in magnetic flux.
What are the steps to determine the direction of induced current using Lenz's Law?
- Determine if the magnetic flux is increasing or decreasing. 2. Determine the direction of the induced magnetic field (opposing the change). 3. Use the right-hand rule to find the direction of the induced current.
What are the steps for using the right-hand rule to find the direction of induced current?
- Point your thumb in the direction of the current. 2. Curl your fingers. 3. Your fingers point in the direction of the magnetic field.
What is the difference 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 increasing vs. decreasing flux regarding induced magnetic field.
Increasing Flux: Induced magnetic field points opposite to the applied field. | Decreasing Flux: Induced magnetic field points in the same direction as the applied field.
Compare primary and secondary coils in a transformer.
Primary Coil: Creates a changing magnetic flux when AC voltage is applied. | Secondary Coil: Experiences induced EMF due to changing flux from the primary coil.