Electric field strength and potential in a charged conducting sphere

by AllenHe
Tags: charged, conducting, electric, field, potential, sphere, strength
AllenHe is offline
Nov19-12, 03:16 AM
P: 74
The electric field strength inside a conducting charged sphere is zero, but why? In the book it says "that the field lines would link charges of opposite sign in the sphere and such a state of affairs is impossible under static conditions in a conductor." I don't really get this sentence.
And if the electric field strength inside a conducting charged sphere is zero, does it mean that the potential inside it is also zero? Or the electric potential is same as the potential on the surface of the sphere?
Phys.Org News Partner Physics news on Phys.org
Physicists design quantum switches which can be activated by single photons
'Dressed' laser aimed at clouds may be key to inducing rain, lightning
Higher-order nonlinear optical processes observed using the SACLA X-ray free-electron laser
mikeph is online now
Nov19-12, 06:12 AM
P: 1,199
If a field line linked two opposing charges, they would accelerate towards one another because they are free to move in a conductor. This acceleration contradicts the assumption that the conditions are static.

Since the electric field is minus the gradient of the electric potential, if there is no electric field then there can be no gradient, ie. the electric potential is uniform over the conducting volume, although not necessarily zero.
AllenHe is offline
Nov20-12, 12:16 AM
P: 74
thanks :)

Register to reply

Related Discussions
Insulating charged sphere in conducting shell and electric field Introductory Physics Homework 2
Electric field strength and electric potential in a sphere Classical Physics 1
Potential Due to a Charged non conducting sphere Introductory Physics Homework 4
Electric Potential (charged conducting sphere) Introductory Physics Homework 8
Charged conducting sphere in a uniform electric field? Advanced Physics Homework 0