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+//===========================================================================
+//chapter 5 example 35
+
+clc;
+clear all;
+
+//variable declaration
+e = 8.85*10^-12;
+V = 10000; //voltage in V
+r = 40*10^-3; //radius in m
+
+//calcaulations
+d = (4/2)*10^-3; //voltage in V
+theta = (100)*(%pi/180);
+k = (2.5*e*(r^2)*(V^2))/(d*theta);
+
+//result
+mprintf("spring constant = %3.3e Nm per radian",k);