Find the charge on the outer surface

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Homework Help Overview

The discussion revolves around a problem related to electric charge, specifically focusing on determining the charge on the outer surface of a given system. The subject area includes concepts from electrostatics and electric fields.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants express uncertainty about the correctness of their answers, with one attempting to confirm their solution. Others question the reasoning behind the calculations and the interpretation of the results.

Discussion Status

The discussion includes attempts to clarify misunderstandings regarding the calculations of charge. Some participants provide supportive comments while others highlight potential errors in reasoning. There is no explicit consensus on the correctness of the answers, but guidance is offered in the form of reminders to check calculations.

Contextual Notes

Participants mention the urgency of an upcoming exam, which may influence the nature of the questions and the desire for confirmation of answers. There is also a reference to forum rules regarding the type of assistance expected.

Fatima Hasan
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Homework Statement


screenshot_59.png


Homework Equations


##E=\frac{kQ}{r^2}##

The Attempt at a Solution


png.latex?%5C%5C900%3D%5Cfrac%7B9*10%5E9*Q%7D%7B0.png

The answer is "A".Right ?
 

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Hello Fatima,

PF is not intended for stamp-approvals. If you convince yourself that -9 nC is the right answer, then that IS your answer for this exercise !

And why shouldn't it be the right answer ?
 
Yeah, well...
 
BvU said:
Hello Fatima,

PF is not intended for stamp-approvals. If you convince yourself that -9 nC is the right answer, then that IS your answer for this exercise !

And why shouldn't it be the right answer ?
I was not pretty sure. Just wanted to confirm my answer. Sorry for multiple questions but my exam is after hours. I wish I have not broken the forum rules. Thanks
 
Last edited:
Best of luck for your test! :wink:
 
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Fatima Hasan said:

Homework Statement


View attachment 223911

Homework Equations


##E=\frac{kQ}{r^2}##

The Attempt at a Solution


View attachment 223912
The answer is "A".Right ?
You wrote that Q=1 nC and then that Q=-10+1 =-9 nC. These are wrong, although the answer "A" is correct. Pay more attention!
 
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ehild said:
You wrote that Q=1 nC and then that Q=-10+1 =-9 nC. These are wrong, although the answer "A" is correct. Pay more attention!
##Q_0=-10+1=-9nC##
 
Fatima Hasan said:
##Q_0=-10+1=-9nC##
-10+1 is not -9 nC . Write out the units at both sides of an equation.
 
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