Two cells are connected between points A and B as shown. Cell 1 has emf of 12 V and internal resistance of 3 Ω. Cell 2 has emf of 6V and internal…

Two cells are connected between points A and B as shown. Cell $\displaystyle 1$ has emf of $\displaystyle 12$ V and internal resistance of $\displaystyle 3 \Omega$. Cell $\displaystyle 2$ has emf of 6V and internal resistance of $\displaystyle 6 \Omega$. An external resistor R of $\displaystyle 4 \Omega$ is connected across A and B . The current flowing through R will be $\displaystyle \_\_\_\_$A.