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+//===========================================================================
+//chapter 5 example 31
+
+clc;
+clear all;
+
+//variable declaration
+d     = 0.1;		//diameter in m
+F      = 0.005;	//force in Newton
+V     = 10000;	//potential diference in V
+e0   = 8.85*10^-12;	//permittivity in N
+d2      = 26.4*10^-3;	//distance between plates in mm
+d1      = 25.4*10^-3;	//distance between plates in mm
+
+//calculations
+
+A      = (%pi/4)*(d^2);		//area of the plates in m**2
+x      = sqrt((e0*A)/(2*F));
+d2      = x*V;				//distance between plates in mm
+//C      = e0*A/d
+x1     = 1/d1;
+x2     = 1/d2;
+C       = e0*A*(x1-x2);		//change in capacitance in uF
+
+//result
+mprintf("change in capacitance due to change in distance between plates from 26.4 to 25.4 mm = %3.2f  u uF",(C*10^12));