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26 Nov 2019

i understand how the answer needs to be determined by finding the change in q followed by dividing this answer by the amount of charge per electron. Where i get stuck is in the finding of the q-after value. The solution shows the use of coulomb's law, however, the q value is squared, why is this so?

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Trinidad Tremblay
Trinidad TremblayLv2
2 Aug 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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This has been bothering me for a long time and I cant find anadequate explanation..

Lets say you have an infinite conducting plate with finitethickness D and it is given charge Q

the charge will be equally split into two and concentrated only onthe two surfaces.

Each surface will get Q/2

and the magnitude of electric field outside the plate isE=Q/(2A*epsilon naught) (E for a conducting plate is surface chargedensity/epsilon naught as opposed to surface chargedensity/(2epsilon naught)

Then, if you have two nonconducting plates separated by distance Dand each plate gets Q/2 which is uniformly distributed ..
then outside the space between the two plates, E = 2*(Q/4A*epsilonnaught)

But why cant we use superposition principle in the case of oneconducting plate with Q and say you get E=Q/(A epsilon naught)i.e.Q/(2A epsilon naught) from each surface...

Is it because we are looking at the mid section of the conductor assome kind of Faraday cage? (since the plate is essentially infinityand blocks the electric field from the other side?)

Also, lets look at two parallel plate capacitor..

One plate gets +Q/2 and the other gets -Q/2

I know the formula says E= charge density/epsilon naught.. so E hasto be Q/(2A epsilon naught) However, it seems rather inconsistentin the case of the parallel plate capacitor...

We know all the charge is going to be concentrated on the innersurface
So shouldnt you get E = Q/(2A epsilon naught) solely from one plateand since you have TWO plates!!!, shoudlnt you multiply Q/(2Aepsilon naught) by 2?

 I just did a follow up on one of the questions here on cramster and seem to be stuck of why or how a certain answer was attained???????

i. Was working in the " Fundamentals of Physics Extened (8th)

By Halliday, Resnick, Walker'' Walker'' chapter 2, equstion 80...........and i just don't understand how AB was calculated, i did as follows to double check and when i divide into tan4.3 i get an answer way lower than what it say on the solution. Why is this am i forgetting a value??????????

 

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