Using kcl 

Q. In a wheatstone bridge  P=1 ohm, Q=2​ ohm , R= 2 ohm, S=3 ​ohm and Rg= 4 ohm. Find the  current through the galvanometer in the unbalanced position of the bridge, When a battery of 2V and internal resistance 2 ohm is used
                                   

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