What is the electric field at the center (in N/C)?

A total of eight tiny conducting spheres, each carrying a charge of -110 nC, are placed one each at the corners of a cube 1.2 m on a side. Find the potential at the center (in V).

What is the electric field at the center (in N/C)?
 

pam

455
0
Just add up the eight potentials.
Use symmetry for E.
 
I understand, but how do I find the potential to begin with?
 
18
0
[tex]V=\frac{q}{4\pi\epsilon_0r}[/tex]
 
Just a Clarification

should leave the q as neg. and nC or convert to C and make positive?;
 

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