Register to reply

Free Charges in a Dielectric Sphere

by *FaerieLight*
Tags: charges, dielectric, free, sphere
Share this thread:
*FaerieLight*
#1
Aug20-11, 05:46 AM
P: 43
Why is it that a dielectric sphere containing free charges, uniformly distributed throughout, has a net electric field? If the sphere is electrically neutral, then all the charges should cancel out, and since the free charges are uniformly distributed, I don't understand why there should be an electric field inside the sphere.
Thanks
Phys.Org News Partner Physics news on Phys.org
Scientists uncover clues to role of magnetism in iron-based superconductors
Researchers find first direct evidence of 'spin symmetry' in atoms
X-ray laser probes tiny quantum tornadoes in superfluid droplets
ZealScience
#2
Aug20-11, 07:05 AM
P: 351
What do you mean? If you say it contains free charges, I think it means that extra charges are added to the sphere because charges of electrons and nuclei are not "free", unless it is in metal. Perhaps I've misunderstood.
*FaerieLight*
#3
Aug20-11, 07:50 AM
P: 43
Sorry about the lack of clarity in my question! It was a reflection of the lack of clarity in my mind.
I think I understand the situation now. The sphere starts off as being electrically neutral, then the free charges are added to the sphere, producing an electric field inside it and outside it.
Am I right in saying that free charges are always added to the dielectric, and the bound charges are always already in the dielectric?
Thanks!


Register to reply

Related Discussions
Dielectric Image Charges. Need Help Please! Advanced Physics Homework 1
Dielectric image charges Advanced Physics Homework 1
Point charge inside Dielectric Sphere embedded in Dielectric Slab Advanced Physics Homework 4
Free charges on a sphere Classical Physics 6
Dielectric and force between charges Advanced Physics Homework 4