Current Electricity: JEE Main 2026 Physics question

Two cells of emfs 1 V and 2 V and internal resistance 2 $\Omega$ and 1 $\Omega$, respectively connected in parallel, gave a current of 1 A through an external resistance. If the polarity of one cell is reversed, then value of current through the external resistance will be $\dfrac{\alpha}{5}$ A. The value of $\alpha$ is ______.