anonymous
  • anonymous
Find the net electric flux through the spherical closed surface shown in the figure below. The two charges on the right are inside the spherical surface. (Take q1 = +1.84 nC, q2 = +1.02 nC, and q3 = -2.91 nC.) N · m2/C
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
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JamesJ
  • JamesJ
By Gauss' theorem, the flux through a Gaussian surface is equal to the sum of the charges inside the surface scaled by 1/4.pi.e0. use that result.
anonymous
  • anonymous
so (Q2+Q3)1/4.pi.e0?

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JamesJ
  • JamesJ
they're the only charges in the surface, yes. I strongly recommend you watch the lecture I just linked in your other question.
JamesJ
  • JamesJ
**correction: no 4.pi. That goes away in the integration.
anonymous
  • anonymous
i was wondering why i was getting the wrong answer lol
JamesJ
  • JamesJ
You know you're in danger in Physics when you're using equations and you don't know where they come from. Use that rule to be intellectually honest with yourself: what is this equation, where did come from, what does it mean physically, can I derive it from first principles in physics?
anonymous
  • anonymous
hmm... so I'm getting ((1.02x10^9)-(-2.91x10^9)/8.85x10^12=-2.14x10^-20 ?? that doesn't seem right
JamesJ
  • JamesJ
That's not the value of the permittivity in a vacuum. http://en.wikipedia.org/wiki/Vacuum_permittivity
anonymous
  • anonymous
oops.. i had put -12 in the calculator.. but not on here. my bad.
JamesJ
  • JamesJ
Also the charges are in nano Coulomb, not giga Coulomb ! -9, not +9
anonymous
  • anonymous
god.. i hate stupid mistakes. lol

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