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 r-soy March 7th, 2011 04:31 AM

How can a changing magnetic field induce an electric current

Hi all,

How can changing magnetic field to induce an electric current ?

Can you give me Faraday’s law, in simple words ?

 MarkFL March 7th, 2011 09:14 AM

Re: How can changing magnetic field to induce an electric cu

Quote:
 The emf induced in a circuit is directly proportional to the time rate of change of magnetic flux through the circuit.
This statement can be written:

$\varepsilon=-\frac{d\Phi_B}{dt}$

where $\Phi_B$ is the magnetic flux threading the circuit which can be expressed as:

$\Phi_B=\int \text{B}\cdot d\text{A}$

This integral is taken over the area bounded by the circuit. The meaning of the negative sign in the equation for $\varepsilon$ is a consequence of Lenz's law.

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