What is Ferromagnetism?
Materials that can become permanently magnetized due to aligned magnetic domains.
What is Paramagnetism?
Materials weakly attracted to magnetic fields but do not retain magnetization.
What is Diamagnetism?
Materials weakly repelled by magnetic fields due to induced opposing magnetic moments.
What is magnetic flux?
A measure of the quantity of magnetism, being the number of magnetic field lines passing through a surface.
What is Electromagnetic Induction?
The process where a changing magnetic flux through a conductor induces an electromotive force (emf).
What is Faraday's Law?
The magnitude of induced emf is equal to the rate of change of magnetic flux.
What is Lenz's Law?
The induced emf creates a current that generates a magnetic field opposing the original change in magnetic flux.
What is the effect of applying an external magnetic field to a ferromagnetic material?
Magnetic domains align, potentially leading to permanent magnetization.
What is the effect of removing the external magnetic field from a paramagnetic material?
The magnetic dipoles return to their random orientation.
What happens when magnetic flux changes through a loop of wire?
An electromotive force (EMF) is induced in the loop.
What is the effect of increasing the speed at which a magnet moves through a coil?
The induced EMF increases, leading to a larger induced current.
What is the effect of increasing the number of loops in a coil on the induced EMF?
The induced EMF increases proportionally ($\varepsilon = -N \frac{\Delta \Phi}{\Delta t}$).
What happens to the induced current based on Lenz's Law?
The induced current generates a magnetic field that opposes the change in the original magnetic flux.
Compare Ferromagnetism and Paramagnetism.
Ferromagnetism: Can be permanently magnetized, strong attraction. Paramagnetism: Weakly attracted, no permanent magnetization.
Compare Paramagnetism and Diamagnetism.
Paramagnetism: Weakly attracted to magnetic fields. Diamagnetism: Weakly repelled by magnetic fields.
Compare Faraday's Law and Lenz's Law.
Faraday's Law: Quantifies the induced EMF. Lenz's Law: Determines the direction of the induced current/EMF.
What is the relationship between magnetic flux and induced EMF?
The induced EMF is proportional to the rate of change of magnetic flux ($\varepsilon = -N \frac{\Delta \Phi}{\Delta t}$).
Differentiate between constant area and constant magnetic field in induced EMF.
Constant Area: Induced emf = Area × (Rate of change of magnetic field). Constant Magnetic Field: Induced emf = Magnetic field × (Rate of change of area).
