Electromagnetic induction of two wires

AI Thread Summary
Two parallel wires, one carrying current and generating a magnetic field, are discussed in relation to electromagnetic induction. The primary wire creates a magnetic field B at a distance r, and the question revolves around calculating the induced electromotive force (E) in a shorter secondary wire. It is clarified that a loop of wire is necessary for induction to occur, raising questions about the physical setup and context of the inquiry. The discussion also references how external factors, like lightning, can induce voltage in conductive materials. Understanding the configuration of the wires is essential for accurate calculations of the induced voltage.
Atria
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I have two wires in parallel at a distance r apart. They are unequal in length. The current carrying primary generates a magnetic field B at distance r. What is the area related to the secondary through which B passes? Is it correct to assume the thickness times the length of the secondary? All I want to do is calculate the value of E, induced in the secondary.
 
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The secondary is shorter than the primary
 
Atria said:
I have two wires in parallel at a distance r apart. They are unequal in length. The current carrying primary generates a magnetic field B at distance r. What is the area related to the secondary through which B passes? Is it correct to assume the thickness times the length of the secondary? All I want to do is calculate the value of E, induced in the secondary.

Atria said:
The secondary is shorter than the primary

Welcome to the PF.

You need a loop of wire for the secondary to induce any voltage and current in it. What is the physical setup exactly? What is the context of the question? Can you post pictures or drawings of the setup?
 
I have read in an article, a while ago, that a lightning bolt induces voltage spikes in conductive objects i.e. lampposts plumbing systems, electrical power networks, etc.
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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