in the picture , we can see that the number of equipotential drop , Nd = 18 . I am not sure why at point a , nd = 1.75 , how to get that ?
The Attempt at a Solution
In my opinion , the Nd at point a can be only whole number . It falls in the 2nd 'curvlinear square' . So , it should be 2 Δh . Correct me if i am wrong .