Engineering What is the relationship between skin depth and AC resistance?

[Callum Plunkett]

Homework Statement

At 1 kHz, the skin depth in copper is 2 mm. Determine the a.c. resistance
at 500 kHz and at 10 MHz of 20 cm lengths of copper conductors having
the following cross sections:
(a) round section 20 mm2
(b) square section 20 mm2
(c) rectangular section 1 mm × 20 mm
Take the conductivity of copper as 5.8 × 107 Sm–1

Relevant Equations

Rac=0.25(1+D/s)Rdc

 

[Babadag]

Rdc is not correct. Take A=20/10^6 m^2 [in sqr.m not in sqr.mm] and δ500kHz=0.0894 mm [2*√(1/500)] not 0.2*√(1/500)

 

[Callum Plunkett]

Thank you for the help! much appreciated.