But when the small coil is moved in or out of the large coil ( B ), the magnetic flux. When the coils are stationary, no current is induced. This induced voltage created by the changing current has the effect of opposing the change in current. This is due to the magnetic field being stronger closer to the magnet ( $V$ is the Volume of the magnet which we integrate over) $$\vec B(\vec r)=\frac=-\partial_t \Phi.$$ Thus the inductive voltage is proportional to the derivative of the Flux $\Phi$ with respect to time. Faraday's experiment showing induction between coils of wire: The liquid battery (right) provides a current which flows through the small coil ( A ), creating a magnetic field. From Faraday's law of induction, any change in magnetic field through a circuit induces an electromotive force (EMF) ( voltage) in the conductors, a process known as electromagnetic induction. The SI unit of magnetic flux is the weber (Wb in derived units, voltseconds), and the CGS unit is the maxwell. The closer the magnet gets to the coil, the bigger is the magnetic field going through the coil and thus the bigger the flux through the coil.
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