Summary
Motional emf refers to the effects on a wire or other conductor that moves
relative to a uniform magnetic field. The action pushes electrons to the lower
end of the wire, and leaves an excess of positive charge at the upper end. This
separation of charges creates a uniform electric field within the wire.Faraday’s law of electromagnetic induction states that the emf induced in a
circuit is equal to the rate of change of the magnetic flux through the circuit.Use the equation.Magnetic flux measures the density of magnetic field lines that cross through
an area. The magnetic flux (ɸB) through an area A is equal to the product of A
and the magnetic field perpendicular to it. Use the equationɸB = B (^) ⊥ A = BA cosθ.
Lenz’s law states that the induced current will always flow in the direction
that opposes the change in magnetic flux that produced it. If Lenz’s law were
not true, then the system would be in violation of the law of conservation of
energy.