Electric potential problem

[drixz]

Hi there,

confused with a question ... does anyone knows the solution or answer for the following question ?

"The electric potential at the centre of a hollow metal sphere, radius 2m, which has been charged to a potential -V. is : (a)-V (b)-2V (c)2V (d)0 (e)V"

[turin]

Consider these ideas/questions:

What is the electric field inside a conductor?
How does the electric field relate to the electric potential (voltage)?
The electric potential function obeys spatial continuity (no jumps).
What is the electric potential just outside the sphere (use Gauss' Law and symmetry).

[drixz]

oh yeah ... thanks for the clue :)