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+//===========================================================================
+//chapter 5 example 30
+
+clc;clear all;
+
+//variable declaration
+d     = 0.08;		//diameter in m
+D     = 0.004;	//distance between plates in m
+F      = 0.002;	//force in Newton
+
+//calculations
+e0   = 8.85*10^-12;	//permittivity in N
+A      = (%pi/4)*(d^2);		//area of the plates in m**2
+x      = (F*2*(D^2))/(e0*A);
+V =      sqrt(x);			//potential diference in V
+
+//result
+mprintf("potential diference = %3.1f V",V);
+mprintf("\nNote:final answer in textbook is wrong printed")