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The Depth of penetration of EM wave in medium having conductivity σ at a frequency of 1 MHz is 25 cm. The depth of penetration at a frequency of 4 MHz will be

6.25 cm
12.50 cm
50 cm
100 cm

Correct Answer: 12.50 cm

Explanation:

Skin depth

⟹ δ₂ = δ₁/2 .

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