AP Physics C E&M: Electromagnetic Induction

electric generator

device for converting mechanical work into electric energy; it induces an emf by rotating a coil in a magnetic field

Faraday's law

The emf induced is the negative change in the magnetic flux per unit time. Any change in the magnetic field or change in orientation of the area of the coil with respect to the magnetic field induces a voltage.

induced electric field

created based on the changing magnetic flux with time

induced emf

short-lived voltage generated by a conductor or coil moving in a magnetic field

Lenz's law

The direction of the induced emf drives current around a wire loop to always oppose the change in magnetic flux that causes the emf.

magnetic flux, ΦB

measurement of the amount of magnetic field lines through a given area

motionally induced emf

voltage produced by the movement of a conducting wire in a magnetic field

Weber

SI unit of magnetic flux, 1 Wb = 1 T*m^2

circuit

The open surface Faraday's Law involves is any arbitrary open surface, not necessarily one bounded by a ___________.

energy

Lenz's Law is supported by conservation of ___________.

field, Area, Orientation

Magnetic flux depends on 3 things:
1.) Strength of magnetic ___________
2.) ___________ through which field lines pass
3.) ___________ of field with surface area

equal

In motionally-induced emf situations, the power of the applied force is ___________ to the power dissipated by the resistor.

integral

The emf around a circuit is equal to the ___________ around a closed loop of the induced electric field.

nonconservative

Unlike the electrostatic field produced by a fixed charge distribution, an electric field induced by a changing magnetic field is ___________ because it does net work in moving a charge over a closed path.

potential

Because an induced electric field is nonconservative, a ___________ energy cannot be associated with it.

changing

Since Kirchoff's loop rule depends on the fact that the electric field is conservative, it does not apply to circuits in which magnetic flux is ___________.

electric

Faraday's Law shows how a varying magnetic field creates an induced ___________ field.