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+//Book Name:Fundamentals of Electrical Engineering
+//Author:Rajendra Prasad
+//Publisher: PHI Learning Private Limited
+//Edition:Third ,2014
+
+//Ex5_12.sce.
+
+clc;
+clear;
+N=20000;
+R=5e2;
+V=250;
+mmf=3471;
+pi=0.04e-3;
+
+printf("\n  (a)")
+I=mmf/N;
+L=(N*pi)/I;
+printf("\n Inductance of the coil=%1.2f H \n",L)
+
+printf("\n  (b)")
+t=log(1/(1-((I*R)/V)))*(L/R);
+printf("\n Time required for the current to reach pickup value=%1.2f ms",t*1E3)
+//The book answer for t (=3.93 ms) is obtained only if R=500 ohm.Otherwise (R=5000) we cannot get the answer
+//So there is a mistake in R value given