Calculating Electric Field Values for Point-Line Plate

[kgal]

Homework Statement

Compute values for the electric field at four different points on the point-line plate. Comment on the validity of your values.

Homework Equations

E = F/q
ΔV = ∫E dot ds

The Attempt at a Solution

I have attached 3 electric field maps that I did in the lab and I also have a data table with voltage after the 7 resistors (E1 - E7). I just don't understand how I can calculate the electric field with what I have.

 

[Redbelly98]

Let's look at this equation:

ΔV = ∫E dot ds

As an approximation, suppose that E is constant between two consecutive equipotential lines. What does the integral become in that case?

 

[kgal]

E∫ds = E*s...

 

[Redbelly98]

E∫ds = E*s...

... = ΔV

So to find E ... ?

 

[kgal]

ΔV / Δs ?
Δs should be in meters?

 

[Redbelly98]

Yes.

 

[kgal]

but where does the distance measurement start?
from the point I want to know the electrical field at to where?

 

[Redbelly98]

The distance is measured between two eqipotential lines, along the E-field line. You can take midway between the eqipotentials as the point where you are calculating E.