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+// Ex12_2 Page:244 (2014)

+clc; clear;

+I = 8;  // Current through the copper wire, A

+d = 18e-03; // Diameter of the copper wire, m

+V = 5;     // Potential difference across the wire, V

+L = 1;  // Length of the copper wire, m

+A = %pi*(d/2)^2;    // Area of cross-section of the wire, Sq.m

+J = I/A;    // Current density in the wire, A/Sq.m

+E = V/L;    // Electric field across the wire, V/m

+rho = E/J;  // Resistivity of the material, ohm-m

+printf("\nThe current density in the copper wire = %4.2e A/Sq.m", J);

+printf("\nThe resistivity of the material = %4.2e ohm-m", rho);

+

+// Result

+// The current density in the copper wire = 3.14e+04 A/Sq.m

+// The resistivity of the material = 1.59e-04 ohm-m 

+// The answer provided in the textbook is wrong