A fully charged capacitor has a capacitance C. It is discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat capacity s and mass n. If the temperature of the block is raised by $∆$T, the potential difference V across the capacitor is

• A

  $\frac{\mathrm{ms\Delta T}}{\mathrm{C}}$

• B

  $\sqrt{\left[\frac{2\mathrm{ms\Delta T}}{\mathrm{C}}\right]}$

• C

  $\sqrt{\left[\frac{2\mathrm{mC\Delta T}}{\mathrm{s}}\right]}$

• D

  $\frac{\mathrm{mC\Delta T}}{\mathrm{s}}$