For a given heat flux, why does a larger thermal conductivity in a body lead to a smaller temperature gradient?
A) Because higher thermal conductivity allows for more efficient heat transfer, reducing the temperature difference between points in the body.
B) Because higher thermal conductivity increases the rate of temperature change within the body, thus minimizing the temperature difference across the body.
C) Because higher thermal conductivity causes thermal energy to spread more evenly throughout the body, resulting in a smaller temperature gradient.
D) Because higher thermal conductivity decreases the rate of heat flow, leading to a decrease in temperature difference within the body.