Magnetic material

Question

The space inside a toroid is filled with tungsten whose permeability is 6.8×10^-5.the percentage increase in the magnetic field will be:-

Answer 1

B_toroid​ = μnI

B = μ₀​nI

B′ = μ₀​μ_r​nI

μ_r​ = 1 + χ

% increase \(=\frac{B'-B}{B}\)

= 6.8 x 10^-3%