- #1

rtareen

- 162

- 32

- Homework Statement
- Attached is a pdf of the practice problem. They make it seem like the thickness L matters but I dont see it in anywhere in the calculations.

- Relevant Equations
- q = CV

I don't really understand the question. I don't understand the wording. We know the plate has a thickness L = 0.50cm. If the charge is coming from the battery wouldn't the electrons have to move the entire distance to reach the face of the plate? Because they have to move all the way from the battery terminal to the face. So the depth they have to move within the plate should be the entire thickness.

I know that a battery can only charge the plates until the capacitor has the same potential difference as the battery. So the charge q on the plate will be q = CV. And the number of electrons it can hold due to having the same potential difference is N = q/e.

I also understand how the number of electrons per unit volume is n = N/Ad.

What i don't undertand is what they mean when they say the electrons "move from a certain depth" to the face. And why they gave us the thickness L

I know that a battery can only charge the plates until the capacitor has the same potential difference as the battery. So the charge q on the plate will be q = CV. And the number of electrons it can hold due to having the same potential difference is N = q/e.

I also understand how the number of electrons per unit volume is n = N/Ad.

What i don't undertand is what they mean when they say the electrons "move from a certain depth" to the face. And why they gave us the thickness L