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+//EXAMPLE 25.2
+//ELECTROMAGNETIC RELAY 
+
+clc;
+funcprot(0);
+
+//Variable Initialisation
+T=800;..........//Total number of turns
+CA=5*5;..........//Cross sectional area in Centi Meter^2
+x1=0.5;..........//Air gap length in Centi Meter
+Li=1.25;.............//Coil current in Amperes
+
+Pag=(4*3.14*10^-7*CA*10^-4)/(agl*10^-2);........//Permeance at airgap
+Lx1=T^2*Pag;.....................................//Coil Inductance at x1 in Henry
+y=round(Lx1*1000)/1000;...........................//Rounding of decimal places
+disp(y,"(a).(i).Coil Inductance in Henry:");
+E=(0.5*y*Li^2);.....................//Energy stored in magnetic field in Joules
+y1=round(E*1000)/1000;...........//Rounding of decimal places
+disp(y1,"(ii).Energy stored in magnetic field in Joules:");
+
+x=poly(0,"x");
+Wfd=(1/2)*T^2*4*3.14*10^-7*CA*10^-4*Li^2/(x);............//Function for mechanical energy in terms of air gap
+y=derivat(Wfd);
+disp(y,"(b).Mechanical Energy :");
+Wfd1=-(1/2)*T^2*4*3.14*10^-7*CA*10^-4*Li^2/(x1^2*10^-4);..............//Mechanical energy at x1=0.5 in Joules
+disp(Wfd1,"Mechanical Energy when evaluated at x=0.5*10^-2 in NW:");
+
+x2=0.25;....................//Air gap in Centi Meter
+Lx2=2*Pag*T^2;................//Coil inductance at x2 in Henry
+r=round(Lx2*1000)/1000;.......//Rounding of decimal places
+Eei=(Li^2)*(Lx2-Lx1);.........//Electrical input during change over of the operating point in Joules
+dWfd=1/2*Eei;..............//Additional stored energy in field in Joules
+Me=Eei-dWfd;................//Mechanical energy based on forced calculation and mechaical displacement in Joules
+disp(Me,"(c).Mechanical energy based on forced calculation and mechaical displacement in Joules:");
+
+Pm2=2*Pag;.........//Slope of OC
+Pm1=Pag;...........//Slope of OH
+BK=1/2*(T*Li);.....//mmf required for establishing a flux with an air-gap of 0.25 in Ampere Turns
+KHC=1/4*Eei;........//Eei=Area of rectangle BDCH in Joules
+Eef=Eei-KHC;........//Electrical energy being fed during the process in Joules
+Ife=Me-KHC;...........//Me=Area of triangle OHC in Joules, Increase in field energy stored
+meo=Eef-KHC;.........//Mechanical energy output in Joules
+disp(BK,"mmf required for establishing a flux with an air-gap of 0.25 in Ampere Turns:");
+disp(KHC,"Area of triangle KHC");
+disp(Eef,"Electrical energy being fed during the process in Joules:");
+disp(Ife,"Increase in field energy stored in Joules:");
+disp(meo,"Mechanical energy output in Joules:");
+
+if Me==meo then
+end
+printf(" Mechanical energy remains unaffected by fast or slow movements of armature");
+
+
+
+
+
+
+
diff --git a/1418/CH25/EX25.2/EX25_2_a.jpg b/1418/CH25/EX25.2/EX25_2_a.jpg
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diff --git a/1418/CH25/EX25.2/EX25_2_b.jpg b/1418/CH25/EX25.2/EX25_2_b.jpg
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+++ b/1418/CH25/EX25.2/EX25_2_b.jpg