Answer:
a) The biggest change is in the North direction towards the south
b) the lowest exchange rate is in the esast -west where the change is zero
Explanation:
The field and the electric potential are related
ΔV = - E ds
In the direction that the field increases the potential decreases
If the electro field points to the north, the potential must have an opposite behavior, or it must decrease towards the North.
Let's apply these deductions to the exercise.
a) The potential is greater towards the SOUTH
Therefore the biggest change is in the North direction towards the south
b) the lowest exchange rate is in the east- west where the change is zero
