According to Ingen Hauz's experiment the thermal conductivity 1 and length L of the metal rod up to which the wax melts are ·related as:

• A

  $\frac{\mathrm{K}}{\mathrm{L}}=\mathrm{constant}$

• B

  $\frac{{\mathrm{K}}^2}{\mathrm{L}}=\mathrm{constant}$

• C

  $\frac{\mathrm{K}}{{\mathrm{L}}^2}=\mathrm{constant}$

• D

  $\mathrm{KL}=\mathrm{constant}$