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**Electric Field**

Hi, first of all I've just found this forum after a few hours of looking at Wikipedia and other websites for the theory and formulas behind this solution but no avail. Thank you to anyone in advanced who can assist me, it'd be much appreciated. Please note that I am usually a person that likes to find out answers for myself but this question has stumped me unfortunately.

## Homework Statement

Two plates are 40mm apart and are charged to the potentials of +300V and -100V with respect to earth as shown in Figure A

**(see attachment)**

a) What is the magnitude and direction of the electric field between the plates?

b) What are the potentials at points A and B (A is 10mm from the bottom plate and B is 30mm from it)

c) Calculate the work done in moving a -4uC charge directly from A to B.

## Homework Equations

E=F/q

V=W/q

(There may be others, but as I was unable to solve the problem I don't know)

## The Attempt at a Solution

(Could not find any solutions, or anything close to it -- Was not able to find the variables for the equations above)

Thanks again in advanced.

#### Attachments

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