Answer: D. 10 V
If power dissipated in the 9 Ohm resistor in the circuit shown is 36 Watt, the potential difference across the 2 Ohm resistors is 10 V.
The power dissipated in the 9 Ohm resistor is 36 W.
If IT is the total current delivered by the voltage source, From the current division technique,
The same current flows through the 2 Ohm resistor,
The potential drop across the 2-Ohm resistor = 2×5=10 V