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+// Example 5.7;apparent resistance of the unknown resistor,actual resistance of the unknown resistor and percentage error
+clc;
+clear;
+// given :
+format('v',7)
+v=200;//voltage in volts
+i=5;//current in mA
+tr=v/i;//resistance in kilo ohms
+disp("part (a)")
+disp(tr,"apparent resistance of unknown resistor is,(kilo-Ohm)=")
+S=1000;//sensivity in ohms/V
+V1=250;//voltage in volts
+rv=V1*S*10^-3;//resistance in kilo ohms
+rx=(V1*tr)/(V1-tr);//resistance in kilo ohms
+disp("part (b)")
+disp(rx,"actual resistance of unknown resistor is,(kilo-Ohm)=")
+per=(rx-tr)/rx;//percentage error
+disp("part (c)")
+disp(per*100,"percentage error is,(%)=")