Applying Ohm’s law, equivalent emf of the two cells = 6 – 4 = 2V
Equivalent resistance = 2 + 8 = 10 Ω
Electric current, I = 6-4/2+8 = 0.2A
When the loop is considered in the anti-clockwise direction, E1 > E2 which means VB > VA
Therefore, VB – VA = 3.6 V