- #1

vysero

- 134

- 0

E = Q/(4(pi)(epsilon)(r^2) therefore Q = E/4(pi)(epsilon)(r^2)

Is this correct or is there a difference between charge Q and charge density?

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- Thread starter vysero
- Start date

- #1

vysero

- 134

- 0

E = Q/(4(pi)(epsilon)(r^2) therefore Q = E/4(pi)(epsilon)(r^2)

Is this correct or is there a difference between charge Q and charge density?

- #2

Much like mass density, charge density is the amount of charge/space The surface charge density is defined as amount of charge per unit area of the surface.

The question is how much charge is in a little shell on the surface between radius r and r+dr per unit area.

in other words: ##\frac{q_{surface}}{A_{sphere}}##. Think for a second: what would happen to a bunch of charges inside of a conducting sphere considering that like charges repel. How much of that charge would be on the surface?

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