Final answer:
The time it takes for the mobile electron sea inside the iron block to reach equilibrium depends on factors like temperature and block size. Equilibrium is typically reached when heat flow and current stabilize.
Step-by-step explanation:
The time it takes for the mobile electron sea inside the iron block to reach equilibrium depends on various factors, including temperature and the size of the iron block. Equilibrium is typically reached when the flow of heat and current within the block stabilizes.
For example, if you have a small iron block and the temperature is relatively high, it may take a shorter amount of time for equilibrium to be reached compared to a larger iron block at a lower temperature.
Factors such as the presence of impurities or the initial conditions of the electron sea may also impact the time required for equilibrium.