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+//===========================================================================
+//chapter 4 example 4
+clc;
+clear all;
+
+//variable declaration
+theta1   = 90;       //deflection in °
+x             = 0.5;      //I2/I1
+
+//calculations
+//Td  proprtional to I
+//theta   proprtional to I
+theta2    = theta1*(x);  	//deflection for the current equal to the half of the current in spring controlled instrument in  °
+//Tc  proprtional to sin(theta)
+//sin(theta) proprtional to I
+y    = sin((%pi/(2)))
+theta21     = asin(x*y);	//deflection for the current equal to the half of the current in gravity  controlled instrument in  °
+theta22  =  (theta21*180)/(%pi);
+
+//result
+mprintf("deflection for the current equal to the half of the current in spring controlled instrument = %3.2f °",theta2);
+mprintf("\ndeflection for the current equal to the half of the current in gravity  controlled instrument = %3.2f °",theta22);
+