Magnetic Field Strength of an Electromagnet given variable currents

AI Thread Summary
To calculate the magnetic field strength B of an electromagnet with a soft iron core, the relevant equation is B = μ₀ * μ_r * (N * I) / L, where μ₀ is the permeability of free space, μ_r is the relative permeability of the core material, N is the number of turns, I is the current, and L is the length of the solenoid. The relative permeability constant for soft iron typically ranges from 1000 to 5000, depending on the specific type of soft iron used. The discussion references a lab experiment involving a variable voltage source and a solenoid with 60 turns of copper wire. For further details, the provided Wikipedia link on solenoids includes additional formulas for both air core and magnetic core solenoids. Understanding these principles is crucial for accurately determining the magnetic field strength in practical applications.
thehoyboy
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I had a lab to do for Physics, and we used a variable voltage source and an electromagnet with 60 turns of copper wire. What is the equation to use to find the magnetic field strength B using relative permeability of a soft iron core? i cannot find this equation anywhere... plus, what is the relative permeability constant for soft iron?
 
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