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Teslas
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Hello friends of the forum! I'm here with a doubt! I have a solenoid of cross-sectional area 5cm and length 9cm with iron core of relative permeability (ur) 9,000, I wonder how to calculate this silenoid!
I think the difficulty is that the effective permeability of the core will be much less than 9,000 because the magnetic path is partly air. This problem comes up in connection with ferrite rod antennas, and there is an article here: http://g3rbj.co.uk/wp-content/uploads/2014/06/Web-The-Inductance-of-Ferrite-Rod-Antennas-issue-3.pdfTeslas said:Hello friends of the forum! I'm here with a doubt! I have a solenoid of cross-sectional area 5cm and length 9cm with iron core of relative permeability (ur) 9,000, I wonder how to calculate this silenoid!
My question istech99 said:I think the difficulty is that the effective permeability of the core will be much less than 9,000 because the magnetic path is partly air. This problem comes up in connection with ferrite rod antennas, and there is an article here: http://g3rbj.co.uk/wp-content/uploads/2014/06/Web-The-Inductance-of-Ferrite-Rod-Antennas-issue-3.pdf
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Teslas said:This question
tech99 said:In the case of the air core, we see the formula with uo in it. But for the second case, iron core, we must also multiply by the effective mu of the magnetic path.
You are correct, we must multiply by the magnetic permeability of the vac (uo) together with the permeability of the magnetic nucleus (ur) in this image that I put, I am in doubt in this formula, B = k.uo.nl, this formula is missing divide by length (L) am I right?
A solenoid is a coil of wire that is tightly wound in a cylindrical shape. When an electric current is passed through the wire, it creates a magnetic field inside the solenoid.
An iron core is a piece of iron that is placed inside the solenoid. It helps to concentrate and strengthen the magnetic field created by the solenoid.
Inductance is calculated using the formula L = (μ0 * μr * N^2 * A)/l, where μ0 is the permeability of free space, μr is the relative permeability of the iron core, N is the number of turns in the solenoid, A is the cross-sectional area of the solenoid, and l is the length of the solenoid.
The inductance of a solenoid wound on an iron core is affected by the number of turns in the coil, the cross-sectional area of the solenoid, the length of the solenoid, and the relative permeability of the iron core.
Calculating the inductance of a solenoid wound on an iron core is important because it helps to understand the behavior and characteristics of the solenoid. It is also necessary for designing and building circuits that use solenoids, such as electromagnets and transformers.