# Electronics and Communication Engineering - Electronic Devices and Circuits - Discussion

Discussion Forum : Electronic Devices and Circuits - Section 3 (Q.No. 4)
4.
The skin depth of copper is found to be 66 mm at 1 MHz at a certain temperature. At the same temperature and at 2 MHz, the skin depth would be approximately
47 μm
33 μm
92 μm
1.22 μm
Explanation:

Skin depth =

Discussion:
8 comments Page 1 of 1.

Mary Jane Malibiran said:   3 years ago
Get the conductivity first using the formula with skin depth= 66mm and w = 2π(1MHz). After getting the conductivity. Use the formula again, get the skin depth using w = 2π(2MHz). Then convert to meter.

Avinash said:   4 years ago
Can anyone explain with given formula?

Vasanth said:   6 years ago
S.D = 46.67 mm = 47 mm.

Azar said:   6 years ago
μ - Permeability = 4* 10^ -7 H/m.
σ - Conductivity in Mho/m or Siemens/m.
ω= 2*f.
f - frequency in Hz.

Ajit said:   7 years ago
S1/S2 = square root (w2/w1),
66 mm/S2 = square root (2/1),
S2 = 66 mm/square root (2),
S2 = 46.67 mm = 47 μm.

Hari charan said:   7 years ago
Yes, by using a formula we get the answer as 47 μm.

Hari charan said:   7 years ago
@Kshama.