If one uses an electric conductor that is much thicker than the skin depth, 8,conductive material is wasted because no current flows in the interior of theQ2(а)conductor. Let us adopt tMy = 28 as an approximate value of the maximumuseful thickness. Find tMU for copper at 60 Hz, 10 MHz and 10 GHz.Conductivity for copper is o = 5.8×10’S/m.(b)An electromagnetic wave is incident normally upon a thick metallic slab. Theelectric field has a magnitude of 10 V/m just inside the surface. What is theelectric field at a point 28 below the surface where 8 is the skin depth?(c)For skin-effect theory to apply, it is necessary for conductivity to besufficiently high. Determine whether skin-effect theory can be applied to:(i)A sample of silicon with relative permittivity ɛ, =11.7, conductivityo = 1000 S/m at frequency f =10 GHz.[4(ii)A sample of seawater with &, = 81, o=4 S/m at f =1 kHz.ON

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