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+// Example 5.10;true resistance of the unknown resistor  , percentage error and reading voltmeter
+clc;
+clear;
+// given :
+format('v',7)
+disp("part (i)")
+ra=0.1;//ohms
+vr=18;//voltage in volts
+am=0.2;//current in amperes
+apr=vr/am;//in ohms
+rv=5000;//ohms
+im=vr/rv;//amperes
+rxi=am-(im);//in amperes
+rx=vr/rxi;//ohms
+disp(rx,"true value of resistance is,(Ohm)=")
+per=((rx-apr)/rx)*100;//percentage error
+disp("part (ii)")
+disp(per,"percentage error is,(%)=")
+rvv=am*(ra+rx);//reading of voltmeter
+disp("part (iii)")
+disp(rvv,"reading of voltmeter is,(V)=")