Which of the following statements related to Wheatstone Bridge are correct?

(A). The bridge is most sensitive when all the four resistances are of the same order
(B). The internal resistance of the cell and the resistance of the galvanometer affect the null point
(C). It does not involve measurement of current and potential difference
(D). Resistances of ammeters and voltmeters do not affect the measurements

Choose the correct answer from the options given below:

(A), (C) and (D) only

The correct answer is Option (4) → (A), (C) and (D) only

Analyze each statement:

(A) Correct — The Wheatstone bridge is most sensitive when all four resistances are of the same order ✅

(B) Incorrect — At null point, no current flows through the galvanometer, so internal resistance of cell and galvanometer resistance do not affect the null point ❌

(C) Correct — Measurement is based on balancing the bridge, not on measuring current or voltage ✅

(D) Correct — Ammeters and voltmeters are not used in the measurement at null point, so their resistances do not affect it ✅

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