# Homework Help: Dielectric material problem

1. Oct 26, 2008

### Sheneron

1. The problem statement, all variables and given/known data
A fully charged parallel plat capacitor remains connected to a battery while a dielectric is slid between. Does the electric field increase, decrease, or remain the same?

3. The attempt at a solution

Don't know this one or how to show it. I know that potential difference is constant and the capacitance and charge will increase, but I can't figure out the E. field.

2. Oct 26, 2008

### Hootenanny

Staff Emeritus
Re: Capacitance

What happens to a dielectric material when it is placed in an external electric field?

3. Oct 26, 2008

### Sheneron

Re: Capacitance

I am not sure

4. Oct 26, 2008

### Hootenanny

Staff Emeritus
Re: Capacitance

Well, what is a dielectric?

5. Oct 26, 2008

### Sheneron

Re: Capacitance

a nonconducting material.

6. Oct 26, 2008

### Hootenanny

Staff Emeritus
Re: Capacitance

Erm... yes, but I meant on the atomic scale. In electromagnetism it is useful to think of dielectrics in a magnetic field as to be composed of dipoles. So, when you have a dipole in an electric field how does it tend to align itself with respect to the electric field?

7. Oct 26, 2008

### Sheneron

Re: Capacitance

Not quite that far along yet. Is there a more simple solution? We haven't talked about dipoles or magnetic fields.