What is the Electric Field at Position D on the Equipotential Surfaces?

[7411]

Homework Statement

The drawing shows a graph of a set of equipotential surfaces in cross section. The grid lines are 2.0 cm apart. Determine the magnitude and direction of the electric field at position D.
Specify whether the electric field points toward the top or the bottom of the drawing.

Homework Equations

E=-ΔV/ΔS
d=2.0x10^-3

The Attempt at a Solution

I am uncertain how to solve for this problem, ΔV is usually between 2 variables, final - initial. Do I repeat this process for each field above point D?

 

[7411]

Guys, help?

 

[Dick]

Guys, help?

You can't say EXACTLY what the E field is. You can only approximate it. I would pick the two nearest points on the equipotential lines and work from there.