Topic: Electromagnetic Theory
Ratio of skin depths of an Electromagnetic wave inside the conductor for the corresponding frequencies at 4 GHz and 9 GHz, considering the same material properties for both the frequencies is:
- A. 9 : 4
- B. 4 : 9
- C. 3 : 2
- D. 2 : 3
Answer: C. 3 : 2
Explanation: Skin depth delta = 1 / $\sqrt{pi * f * mu * sigma}$, so delta is inversely proportional to $\sqrt{f}$. delta(4 GHz) / delta(9 GHz) = $\sqrt{9 / 4}$ = 3 / 2.