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## Homework Statement

A point charge is at the center of a conducting hollow sphere, with radius 0.011m, that is within another conducting hollow sphere of radius 0.041m. The point charge is Q

_{0}=+4.30e-6 C, the inner sphere has a net charge of Q

_{1}=-1.70e-6 C, and the outer sphere has a net charge of Q

_{2}=+6.50e-6 C.

Calculate the magnitude of the electric field at a point A located 0.021m from the center.

## Homework Equations

Gauss' Law [tex]\Phi[/tex]= Q

_{in}/ [tex]\epsilon[/tex] = E*Area

_{s}

Area

_{s}=4[tex]\pi[/tex]r

^{2}

[tex]\epsilon[/tex]=permittivity constant

## The Attempt at a Solution

I've been stuck on this for awhile and don't really know where to begin. I know point A is between the two hollow spheres, one of which is positive, the other negative. But I don't know what to think of the conducting spheres when they aren't in electrostatic equil because they don't have net Q=0. Will the E of point A just be the sum of the electric fields of the spheres and point charge?

E

_{A}= E

_{0}+E

_{1}+E

_{2}?

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