Read the following statements regarding a Wheatstone bridge: (A) The sensitivity of a Wheatstone bridge is maximum when the resistances of all its four arms are of the same order. (B) If the positions of the cell and the galvanometer are interchanged in a balanced Wheatstone bridge, the null point is disturbed. (C) A Wheatstone bridge is not suitable for measuring very low resistances because the resistance of the co

Step-by-step solution

Statement (A) is correct: A Wheatstone bridge is most sensitive when all four arm resistances are of the same order of magnitude. Statement (B) is incorrect: According to the reciprocity theorem, interchanging the positions of the battery and the galvanometer in a balanced Wheatstone bridge does not affect the balance condition. Statement (C) is correct: For very low resistances, the contact resistances and the resistance of the connecting leads become comparable to the unknown resistance, introducing significant e