Easy problem , not for me though

1. Jun 30, 2009

Luhter

If I have a sphere and that has radius r and electric charge density of x
Then outside the sphere , in void (permittivity=$$\epsilon 0$$) , a point A which is at r+a distance from the sphere's center . What is the charge at point A ?

Ok i tried this at exam in a way with Gauss law,but it seems it was no good ... so I'm curious how is made

2. Jun 30, 2009

djeitnstine

Gauss's Law works, how did you attempt it? $$\int E \cdot dA = \frac{Q_{enc}}{\epsilon_0}$$

what type of charge density is it? linear, area or volumetric... either case you need to convert the enclosed charge term to its density form.

3. Jul 1, 2009

turin

This question is nonsensical (or trivial if all of the charge is described by the problem statement).

4. Jul 1, 2009

Wax

I'm curious, which physics is this?

5. Jul 1, 2009

queenofbabes

I suppose the question is actually asking for electric field strength?