The following statements are given related to Wheatstone Bridge:

(A) when Wheatstone Bridge is balanced, no current flows through the galvanometer arm.
(B) Wheatstone Bridge works on the principle of Kirchhoff's law.
(C) Being a null method based experiment, the result is free from the effect of extra resistances (cell resistance) of the circuit
(D) Wheatstone Bridge is most sensitive when all the four resistances are nearly of the same magnitude.

Choose the correct answer from the options given below:

(A), (B), (C) and (D)

Correct statements: (A), (B), (C), and (D)

Explanation:

(A) In a balanced Wheatstone Bridge, the potential difference across the galvanometer is zero, so no current flows through it.

(B) The bridge works on Kirchhoff’s laws — one for current (junction rule) and another for potential (loop rule).

(C) As it is a null method, no current flows through the galvanometer at balance, making the result independent of internal resistance of the cell.

(D) The bridge is most sensitive when all resistances are nearly equal, providing maximum accuracy in measurement.