Physics Help Forum Electric flux

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 Jul 2nd 2019, 09:01 PM #1 Banned   Join Date: Jul 2019 Posts: 6 Electric flux Hello sir How to solve this an electric charge of 8.85*10^-13 C is placed at the center of a sphere of radius 1m. The electric flux through the sphere is: 1. 0.2NC ^-1 m² 2. 0.1NC ^-1 m² 3. 0.3NC ^-1 m² 4. 0.01NC ^-1 m²
 Jul 2nd 2019, 09:11 PM #2 Forum Admin     Join Date: Apr 2008 Location: On the dance floor, baby! Posts: 2,730 First, this is not a Mecanics question. I am moving the thread to the "Electricity and Magnetism" Forum. Hint: What is the equation for electric flux? -Dan __________________ Do not meddle in the affairs of dragons for you are crunchy and taste good with ketchup. See the forum rules here.
 Jul 2nd 2019, 09:54 PM #3 Banned   Join Date: Jul 2019 Posts: 6 Φ = E A cos(θ) Φ = 8.85*10^-13C*3.14*1m²=27.789Cm²*10^-13
Jul 3rd 2019, 02:01 AM   #4

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 Originally Posted by TYUTNTT Φ = E A cos(θ) Φ = 8.85*10^-13C*3.14*1m²=27.789Cm²*10^-13
That isn't correct. If you are going to use that form then you need to integrate over the angle $\displaystyle \theta$ as it covers the whole surface of the sphere.

The flux through a sphere with a single point charge encolsed in a sphere is
$\displaystyle \Phi _E = \dfrac{q}{ \epsilon _0 }$

I can show you this using Gauss' Law but it doesn't seem to me that you know Calculus.

-Dan
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Last edited by topsquark; Jul 3rd 2019 at 02:08 AM.

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