According to the first law of thermodynamics, the total amount of energy in the universe .

is constant

Explanation:

Energy cannot be destroyed or created, but can transfer from places to places and in different forms.

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

im guessing the west of station b