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- Homework Statement
- Why is this equation: B(D - d)/mu + Bd = mu0 N I true?

- Relevant Equations
- Ampere's Law

Why is this equation: B(D - d)/mu + Bd = mu0 N I true?

B = magnetic field in the hole of the toroid

D = Average diameter of the toroid

d = Diameter of hole of toroid

mu = relative permeability of iron, or whatever the toroid is made of

mu0 = 4pi x 10^-7

N = Number of turns on the toroid

I = current through each turn of the toroid

B = magnetic field in the hole of the toroid

D = Average diameter of the toroid

d = Diameter of hole of toroid

mu = relative permeability of iron, or whatever the toroid is made of

mu0 = 4pi x 10^-7

N = Number of turns on the toroid

I = current through each turn of the toroid

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