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    Alexander Smeets
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    We know that a = µ * B_J / I*J, and assuming J_1 = J_2 and B_J1 = B_J2, we can write: B_J1 / J_1 = B_J2 / J_2 <=> a_1 * I_1 / µ_1 = a_2 * I_ 2 / µ_2, which can be rewritten to find µ_2 = µ_1 * a_2 * I_2 / a_1 * I_1.

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