Is Grounding a Shell Equivalent to Zero Electrical Charge?

[gracy]

When the shell is grounded(at zero potential), it is essentially empty of any electrical charge. Is it true?I think ,yes.But I think it should be

When the shell is grounded, it is essentially empty of any excess electrical charge.
Right?

 

[BvU]

What's this tread about ? There clearly is a context missing! What shell ? What charge ? What sequence of events ?

 

[ehild]

Wrong, a grounded conductor can be charged.

 

[gracy]

a grounded conductor can be charged

You mean with non zero net charge?

 

[ehild]

"charged" means nonzero net charge or excess charge. A neutral conductor is not charged in spite that it contains positive ions and negative electrons.

 

[BvU]

You mean with non zero net charge?

Simple example: hollow conducting sphere with a charge Q at the center, so a mirror charge of -Q on the inside. If it's neutral there is +Q on the outside. If the outside is then grounded,, the +Q flows away. The outside is at zero potential, but the shell has net charge -Q.

 

[gracy]

Thanks.
I understood now.