Consider an electrical circuit containing a two way switch 'S'. Initially S is open and then T₁ is connected to T₂. As the current in R = 6$\Omega$ attains a maximum value of steady state level, T₁ is disconnected from T₂ and immediately connected to T₃. Potential drop across r = 3$\Omega$ resistor immediately after T₁ is connected to T₃ is __________ V. (Round off to the Nearest Integer)