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ku1005
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Guassian Surface Decision?
http://img412.imageshack.us/img412/4056/electroquestionhd7.png
http://img337.imageshack.us/img337/6898/guasslawdd2.png
My thoughts/attack for the question is first to find the charge
density throughout the insulator
which i caculate to be : 4*10^-9 C/m^3
Now, use a quassian surface, such that using the volume and thus
charge density above, of this guassian shape, I can calculate the
charge enclosed by it.
Then, at all points on the guassian surface, the Electric field will
be equivalent and therefore using the surface area, it should collapse
down to something nice like
E= q/[(epsilon 0) * (SA of Shape)]
BUT...the problem is I can't get the correct answer, I GET
~0.9v/M...whereas the answer is 0.68V/m.
Im findind it difficult to select a correct guassian surface for the calculation, has anybody got any thoughts/tips/recommendations about how I shuld alternative attack or a guassian surface I shhould choose?
Thanks for your time!
Homework Statement
http://img412.imageshack.us/img412/4056/electroquestionhd7.png
Homework Equations
http://img337.imageshack.us/img337/6898/guasslawdd2.png
The Attempt at a Solution
My thoughts/attack for the question is first to find the charge
density throughout the insulator
which i caculate to be : 4*10^-9 C/m^3
Now, use a quassian surface, such that using the volume and thus
charge density above, of this guassian shape, I can calculate the
charge enclosed by it.
Then, at all points on the guassian surface, the Electric field will
be equivalent and therefore using the surface area, it should collapse
down to something nice like
E= q/[(epsilon 0) * (SA of Shape)]
BUT...the problem is I can't get the correct answer, I GET
~0.9v/M...whereas the answer is 0.68V/m.
Im findind it difficult to select a correct guassian surface for the calculation, has anybody got any thoughts/tips/recommendations about how I shuld alternative attack or a guassian surface I shhould choose?
Thanks for your time!
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