Correct Answer - Option 2 : lower
Explanation:-
Fourier’s law of heat conduction as
\(Q = - kA\frac{{dT}}{{dx}}\)
where
k = thermal conductivity of the material, A = area normal to the direction of heat transfer
dT/dx = temperature gradient
If the rate of heat transfer is the same
k↑ ⇒ dT/dx ↓
i.e. As the thermal conductivity increases, temperature gradient decreases.