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+//===========================================================================
+//chapter 5 example 34
+
+clc;
+clear all;
+
+//variable declaration
+e0          =8.854*10^-12;
+d           =0.05;
+er          = 1;        
+a           = 0.25;
+V1           = 12000;            //voltage in V
+V2           = 32000;            //voltage in V
+
+
+//calculations
+//x-x0      = (1/2)*((V^2)/k)*(dc/dx)
+//C     =(2*e0*er*A)/d
+//dC    =(2*e0*er*a*x)/d
+// y = dC/dx = (2*e0*er*a)/d
+y       = (2*e0*er*a)/d;
+X1       = 0.25/4;
+// A =x1+x01      = (1/2)*((V1^2)/k)*(dc/dx)
+X2       = 0.25/2;
+//B = x2+x01      = (1/2)*((V2^2)/k)*(dc/dx)
+//C    = B/A   =(V2/V1)^2
+C       =   (V2/V1)^2;
+x01      = (X2-(C*X1))/(1-C);
+k          = ((1/2)*((V1^2))*(y))/(X1-x01);
+X3      = (3/4)*0.25;
+V       = sqrt(((X3-x01)*2*k)/y);           //voltage in V
+
+//result
+mprintf("voltage required to pull the plate three quarte way in = %3.3f KV",(V*10^-3));
+
+
+
+