(A) : Greater is the coefficient of thermal conductivity of a material, smaller is the thermal resistance of a rod of that material.
( R): Thermal resistance is the ratio of temperature difference between the ends of the conductor and rate of flow of heat.

Options

A. Both (A) and (R) are true and (R) is the correct explanation of (A)
B. Both (A) and (R) are true and (R) is not the correct explanation of (A)
C. (A) is true but (R) is false
D. Both (A) and (R) are false

Answer

B