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Describe the concept of leakage flux, useful flux and fringing with neat diagram.

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Concept of leakage flux, useful flux and fringing: 

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Leakage flux: Some flux while passing through the magnetic circuit, leaks through the air surrounding the core. This flux is called as leakage flux. 

Useful flux: The flux in the air gap which is actually utilized for various purposes depending upon the application is called as useful flux 

Fringing: When the magnetic flux passing or crossing an air gap then it tends to bulge outwards the iron ring, this effect is called as “Fringing”.

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