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
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they're the only charges in the surface, yes. I strongly recommend you watch the lecture I just linked in your other question.
**correction: no 4.pi. That goes away in the integration.
i was wondering why i was getting the wrong answer lol
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?
hmm... so I'm getting ((1.02x10^9)-(-2.91x10^9)/8.85x10^12=-2.14x10^-20
?? that doesn't seem right
That's not the value of the permittivity in a vacuum.
oops.. i had put -12 in the calculator.. but not on here. my bad.
Also the charges are in nano Coulomb, not giga Coulomb !
-9, not +9