Which are coorect statement ?
(1) The Wheatstone bridge is most sensitive when all the four resistances are of the same order
(2) Kirchhoffs first law (for currents meeting at a junction in an electric circuit) expresses the conservation of charge.
(3) The rheostat can be used as a potential divider.
(4) In a balanced Wheatstone bridge, interchanging the positions of galvanometer and cell affects the balance of the bridge.