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+
+i=20D-3 //current throught the coil
+r=4 //resistance of coil
+V=i*r
+//when total current to be measured=2 A
+Is=2-i //shunt current
+R1=V/Is
+mprintf("Resistance of shunt for 2A range=%f ohm\n",R1)
+//when total current to be measured=4 A
+Is=4-i //shunt current
+R2=V/Is
+mprintf("Resistance of shunt for 4A range=%f ohm\n", R2)
+//when total current to be measured=6 A
+Is=6-i //shunt current
+R3=V/Is
+mprintf("Resistance of shunt for 6A range=%f ohm",R3)