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+// FUNDAMENTALS OF ELECTICAL MACHINES 
+// M.A.SALAM 
+// NAROSA PUBLISHING HOUSE 
+// SECOND EDITION
+
+// Chapter 2 : BESICS OF MAGNETIC CIRCUITS 
+// Example : 2.12
+clc;clear; // clears the console and command history 
+
+// Given data
+l = 25*10^-2   // length of air-core coil in m
+A = 4*10^-4    // cross sectional area in m^2
+N = 65         // number of turns
+myu_0 = 4*%pi*10^-7 
+myu_r = 1
+
+// caclulations 
+myu = myu_0*myu_r 
+L = N^2*myu*A/l  // inductance in H
+
+// display the result 
+disp("Example 2.12 solution");
+printf(" \n Inductance of the coil \n L = %.1e H \n", L);
+