- #1

- 69

- 0

## Homework Statement

Figure 1 shows a pair of parallel metal plates, A and B, fixed vertically 20mm apart with a potential difference of 1500V between them.

(a)(i) Draw the electric field lines in the space between the plates and calculate the electric field strength at point P.

(a)(ii)Sketch a graph showing the potential at different points in space between the plates.

## Homework Equations

[tex]E_{f}=\frac{V}{x}[/tex]

## The Attempt at a Solution

The first part is shown in the diagram by my (rather scruffy)red lines; they are drawn better on my actual diagram.

For the potential at P:

[tex]E_{P}=\frac{1500/2}{(20 \times 10^{-3})/2} = 7.5 \times 10^{4}Vm^{-1}[/tex]

For the last part I have a 100mmx60mm piece of graph paper with the labels 'potential' and 'distance' on the vertical and horizontal axes respectively.

Now, in my thinking all I can get from this is that the graph must start at 0, and the gradient must be [tex]E[/tex].

__c.f.__[tex]y = mx + c[/tex] and you get [tex]V = Ex (+ 0)[/tex].

I have my values for [tex]V[/tex] from (0>1500)V on my potential axis and my values for [tex]x[/tex] from (0>20.0)e-3m.

The problem with this is I can see everything that is going on, but I just cannot draw a graph of it; and it's really starting to annoy, so any help would be appreciated.

#### Attachments

Last edited: