The National Electrical Code specifies, among otherthings, values for the minimum allowable cross-sectional area ofconductors for a given voltage and allowable total length ofcircuits depending on the diameter of conductor used. Based on your knowledge of the motion of charge carriersand the origins of electrical resistivity, a) explain why there isa minimum allowable cross-sectional area for a given appliedvoltage, b) what needs to be considered when calculating it, c) why there is a maximum allowable total length of electrical circuitsfor a given conductor diameter, and d) what needs to be consideredwhen calculating it.