41. In given circuit current through AB is zero, then what will be the value of unknown resistance 'X' 1 . 10 Ω 2 . 5 Ω 3 . 40 Ω 4 . 15 Ω Share with your friends Share 11 Shobhit Mittal answered this if current through AB is zero then the wheatstone bridge must be balanced.10x=520x=2005=40 ohm .Regards 2 View Full Answer