Electric field outside of conducting sphere.

AI Thread Summary
The discussion centers on calculating the electric field just outside a conducting sphere with a radius of 0.01 m and a charge of 1.0 × 10–9 C. The initial calculation using the formula E=kq/r^2 resulted in an electric field of 90,000 N/C, which is incorrect according to the expected answer of 900 N/C. Participants suggest verifying the calculations and the values used, particularly the permittivity of the medium. There is confusion regarding the discrepancy in the expected answer, prompting a request for clarification on the calculations. The conversation highlights the importance of ensuring all variables and constants are correctly applied in the formula.
ramses07
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Homework Statement



A conducting sphere of radius 0.01 m has a charge of 1.0 × 10–9 C deposited on it. The magnitude of the electric field in N/C just outside the surface of the sphere is

Homework Equations


E=kq/r^2

EA=q/eo


The Attempt at a Solution



I tried the first equation and got 90000, but the answer is 900. I am racking my brains here trying to understand how to find the answer. Its seems simple enough, I am probably just missing a step, can anybody point to what I am doing wrong.
 
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Could you show your calculations so far? Then can see where you're going wrong. :smile:
 
Does the question mention the permittivity of the medium outside the sphere?
 
..also I got E=90000NC^{-1} as well. Where did you get that the answer should be E=900NC^{-1}? Also check those values you've been given are correct (but they seem OK).
 

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