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+//control systems by Nagoor Kani A
+//Edition 3
+//Year of publication 2015
+//Scilab version 6.0.0
+//operating systems windows 10
+// Example 2.1
+clc;
+clear;
+n=300;// number of turns
+li=0.01//linearity =1%
+v=30//voltage=30V
+kp=v/n
+disp(kp,'Potentiometer constant in (volts/turn)')
+nmid=n/2
+vmid=kp*nmid
+disp(vmid,'Voltage at mid point is;')
+disp('Range of voltage at mid point with 1% linearity is 14.7volts to 15.3 volts')//vmid(+-)0.3
+//assuming potentiometer is perfectly linear so the resistance at midpoint setting from reference is 50kiloohm
+//load resistance of 500Kiloohm  is connected in parallel with potentiometer
+req=(500*50)/(500+50)
+v0=(v*req)/(50+req)//using voltage divison rule
+disp(v0,'Voltage at midpoint with load resistance 500Kiloohm (in volts)')
+