- #71
gracy
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Then why we took this charge -q (supplied by earth) in calculation of net potential of sphere B if there is no net charge on outer surface of shell C?gracy said:yes,there is no charge anymore on the surface
Then why we took this charge -q (supplied by earth) in calculation of net potential of sphere B if there is no net charge on outer surface of shell C?gracy said:yes,there is no charge anymore on the surface
We did not. But there was -q charge on the shell C (on the inner surface) and we calculated with the potential due to it.gracy said:Then why we took this charge -q (supplied by earth) in calculation of net potential of sphere B if there is no net charge on outer surface of shell C?
Charge has no identity.You can not say why that charge is balanced and not the other.gracy said:There is still one thing I don't understand that why don't the induced charges on shell c cancel each other as induced charges of shell B do?Why +q on outer surface of shell C is neutralized or balanced by charge coming from Earth and not by -q charge present on inner surface of shell C?
I just want to know why that -q charge stops on inner surface of shell C why it does not go beyond it.I mean if charge -q goes to inner surface of shell B it will be much more closer to +q charge.ehild said:The -q charge of C (which is there as q charge was pushed into the ground by A ) is distributed as close to the positively charged A shell as possible, that is on the inner surface of C.
I believe the answer is in #12 and #13.There is already -q charge on the inner surface of B and +q on the outer surface, making E=0 in the thickness of B. So, +q responsible for emitting flux lines is actually on the outer surface of B. Hence,gracy said:One last question
I just want to know why that -q charge stops on inner surface of shell C why it does not go beyond it.I mean if charge -q goes to inner surface of shell B it will be much more closer to +q charge.
Charge is attribute, not entity. Only charged particles can move in the metal shell, (electrons) but they can not leave the metal. They stop at the surface.gracy said:One last question
I just want to know why that -q charge stops on inner surface of shell C why it does not go beyond it.I mean if charge -q goes to inner surface of shell B it will be much more closer to +q charge.
Charge needs a conductive path to follow in order to move unless the field is strong enough to overcome the work-function of the metal and "pull" the charge carriers off of it (electrons in this case), or if enough energy is supplied to the charge carriers for them to escape the surface. See, for example, the photoelectric effect, or thermionic emission.gracy said:One last question
I just want to know why that -q charge stops on inner surface of shell C why it does not go beyond it.I mean if charge -q goes to inner surface of shell B it will be much more closer to +q charge.
It is the same thing as post #73.gracy said:...
And the same thing as in post #73.But yes one more thing this charge supplied by Earth is also considered as induced charge.