A thin uniform wire AB of length 1m, an unknown resistance X and a resistance of 12Ω are connected by thick conducting strips as shown in figure. A battery and a galvanometer (with a sliding jockey connected to it) are also available. Connections are to measure the unknown resistance X using the principle of Wheatstone bridge. The appropriate connections are.
(E Is the balance point for Wheatstone bridge)
(A) battery across EB and galvanometer across BC
(B) battery across EC and galvanometer across BD
(C) battery across BD and galvanometer across EC
(D) battery across BC and galvanometer across CD
