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4 micron
Ra is the roughness of the surface used in engineering. Mu(greek letter)metres is one millionth of a metre. To put in perspective glass would be around Ra 0.1, polished chrome plating would be around Ra 0.3 so Ra 0.8 is still fairly smooth but a dull finish. You would just be able to feel the surface with your fingernail.
20 ra is worse
what do you mean by Ra and Rz values
FOR WIRE A , RA = rho L/A = rho L/pie* r square -equation 1 RB = rho 2L/pie(2r)square = rho 2L/4 pie*r square =rho L/2 pie * r square -equation 2 RA/RB = rho L/pie * r square * 2 pie *r square/rho L RA/RB = 2 RA = 2RB , RB = RA/2 1/Rp = 1/RA + 1/RB =1/RA +1/RB 1/Rp = 3/RA Rp/RA = 1/3 Hence the ratio is 1:3