$\begin{array}{1 1} \text{(1) Wheatstone bridge is the most
sensitive when all the four
resistances are of the same order of
magnitude.} \\ \text{(2) In a balanced wheatstone bridge if
the cell and the galvanometer are
exchanged, the null point is
disturbed.} \\\text{(3)A rheostat can be used as a potential divider.} \\\text{(4)Kirchhoff’s second law represents energy conservation.} \end{array} $
