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 March 7th, 2011, 04:31 AM #1 Senior Member   Joined: Oct 2009 Posts: 895 Thanks: 1 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 ?
March 7th, 2011, 09:14 AM   #2
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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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