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 happens when magnetic flux through a loop increases?
An induced current is generated, creating a magnetic field opposing the increase.
What is the effect of moving a conductor through a magnetic field?
An electromotive force (EMF) is induced in the conductor.
What is the effect of a changing magnetic field near a conductor?
It induces a voltage (EMF) in the conductor.
What happens when the magnetic flux is decreasing?
The induced magnetic field points in the same direction as the applied field.
What happens when a conductor moves through a magnetic field in magnetic braking?
Induced currents dissipate kinetic energy as heat, slowing down the object.
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.