The question refers to a figure, but the figure itself is not provided in the prompt. Since the potential difference between points $A$ and $B$ depends entirely on the circuit/diagram, the value cannot be derived uniquely from the given text alone.

Step 1: Identify the missing information

The statement says:

"In the figure, potential difference between $A$ and $B$ is..."

So the answer requires the actual figure showing the arrangement of components and points $A$ and $B$.

Step 2: Can the answer be computed without the figure?

No. Without the circuit/figure, we do not know:

1. what elements are connected,
2. where points $A$ and $B$ are located,
3. whether any diode/transistor/battery arrangement is involved,
4. polarity and values of sources.

Hence, a step-by-step physical calculation is not possible from the text alone.

Step 3: Compare with stored answer

The stored correct answer is A: $10\,\text{V}$.

Because the essential figure is missing, I cannot independently verify that result. Therefore I should not claim agreement based on evidence.

If you provide the figure, I can solve it properly and verify whether the answer is indeed $10\,\text{V}$.