In a Wheatstone bridge, the arms P and Q are in series on one side and R and S are in series on the other, with P and R meeting at one battery terminal. The galvanometer joins the junction of P and Q to the junction of R and S. Statement I: If the battery and the galvanometer of a balanced bridge are interchanged, the galvanometer shows a deflection. Statement II: A bridge with $P = 10\ \Omega$, $Q = 20\ \Omega$, $R = 30\ \Omega$ and $S = 50\ \Omega$ is balanced.