# Electrostatics, sphere question.

1. Oct 9, 2011

### vkash

1. The problem statement, all variables and given/known data

A spherical conductor A contains two spherical cavities. The total charge on the is itself zero. However, there is a point charge qb at the center of one cavity and qc at the center of other cavity. A considerable distance r away from the center of the spherical conductor, there is a another change qd. Force acting on qb , qc, qd, are F1 ,F2,F3 respectively [assume all changes are positive.]then fill the dashed lines with <,>,=
F1______F2______F3

2. Relevant equations

I use inly one equation in such questions that is
Code (Text):

closed integral over closed surface(E.ds)=q/e.

It is gauss law.

3. The attempt at a solution

2. Oct 9, 2011

### WJSwanson

Have you tried creating a visual representation to choose your Gaussian surfaces? The problem appears (as you've written it) to say that there is a pair of point charges in the cavities. The charge on a conductor aligns itself to negate any net electric field. What does this tell you about the charge configuration on the conductor if its net charge is 0?

What does this mean about the way the external charge qd interacts with the other charges?

3. Oct 9, 2011

### vkash

diagram of question

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