How do you find the B field between finite wires?

Thread starter Frostfire
Start date Jun 7, 2010
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B field Field Finite Wires

AI Thread Summary

To find the magnetic field between finite wires, the Biot-Savart law is applied, integrating over the finite length of the wire rather than assuming it is infinite. The approximation of treating a wire as infinite typically holds until the distance from the wire is significantly less than its length, with a common cutoff suggested around 10%. This means that for distances greater than 10% of the wire's length, the infinite wire approximation may no longer be valid. The discussion emphasizes the importance of adjusting calculations based on the wire's finite length to achieve accurate results. Understanding these principles is crucial for precise electromagnetic field calculations.

Jun 7, 2010

Frostfire

I know the results for infinite, but how about finite? And where is the cutoff with the aproximation of infinite? I've heard the value 10% tossed around is that right?

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Jun 8, 2010

graphene

if u have used bio savart law to find the field of an infinite wire, u wud have integrated along the comple length (infinite) of the wire.
now just integrate along the finite ength of the wire

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