Some unknown material has a conductivity of 106 mho/m and

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Some unknown material has a conductivity of 10⁶ mho/m and a permeability of 4 π × 10^–7 H/m. The skin depth for the material at 1 GHz is—

1. 15.9 µm
2. 20.9 µm
3. 25.9 µm
4. 30.9 µm

Correct Option: A

From the synopsis provided skin depth is given by relation

δ =	1
δ =	√∏fμσ

δ =	1
δ =	√∏ + 10⁹ + 10⁶ × 4∏ × 10^-7

= 15.9 μm