# Homework Help: Electric Field Strength Question

1. Jan 16, 2005

### DLxX

I need help with the following question.

A diopole is made up of two charges, Q1 and Q2, that are seperated by a distance of 1 meter. Q1 has a charge of +3C and Q2 has a charge of -3C. What is the electric field strength of the field set up by these two charges at a point exactly halfway between them?

I know the formula for this type of question, and it seems fairly simple as far as just entering in the values, but I'm having a hard time figuring out what Q and the distance is going to be.

2. Jan 16, 2005

### dextercioby

Hold on,what Q??The distance is half a meter...

You just have to add two vectors,that's it.

Daniel.

3. Jan 16, 2005

### Gokul43201

Staff Emeritus
DLxX,

Have you heard of the superposition principle ? Do you know how to calculate the field at a certain distance from a point charge ?

4. Jan 16, 2005

### Athalus

Yeah its just superposition, just take the E field generated with respect to Q1 at the midpoint, as if Q2 did not exist, and add it to the E field generated with respect to Q2 at the midpoint, as if Q1 did not exist, and you should get your net E field.

Athalus

5. Jan 16, 2005

### dextercioby

Exactly,so do that...

Daniel.