A fully charged capacitor of capacity ' $\mathrm{C}$ ' is discharged through a small resistance wire embedded in a solid block of specific heat ' $\mathrm{s}$ ' and mass ' $\mathrm{m}$ ' under thermally isolated conditions. If the temperature of the block is raised by $\Delta \mathrm{T}$, the initial potential difference across the capacitor is

• A

  $\begin{aligned} & \left(\frac{\mathrm{ms} \Delta \mathrm{t}}{\mathrm{C}}\right)^2 \end{aligned}$
• Correct answer
  B

  $\begin{aligned}& \left(\frac{2 \mathrm{~ms} \Delta \mathrm{t}}{\mathrm{C}}\right)^{1 / 2} \end{aligned}$
• C

  $\begin{aligned} &\frac{\mathrm{ms} \Delta \mathrm{t}}{\mathrm{C}}\end{aligned}$
• D

  $\begin{aligned}& \frac{3 \mathrm{~ms} \Delta \mathrm{t}}{\mathrm{C}}\end{aligned}$

Hence, the correct answer is option: 'B'.