Gold is a good conductor with a resistivity of 2.44 × 10 Ω·m and is essentially nonmagnetic: μ μ r = 1, so its skin depth at a frequency of 50 Hz is given by δ δ = 503 2.44 ⋅ ⋅ 10 − − 8 1 ⋅ ⋅ 50 = 11.1 m m