In each figure, the dashed circle is the cross section of a closed Gaussian surface. +2.0 mC +2.0 mC q=? +3.0 mC -3.0 mC The net electric flux passing through the Gaussian surface is +3.9 × 108 N · m²/C. What is the value of the unknown charge?

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### Example Problem for Applying Gauss's Law

#### Instructions
In each figure, the dashed circle represents the cross section of a closed Gaussian surface.

#### Diagram Description
In the provided diagram:
- Several point charges are shown, both inside and outside the dashed circle (representing a Gaussian surface):
  - Inside the circle: 
    - +2.0 mC (milliCoulombs) 
    - +3.0 mC
    - + an unknown charge (labeled as \(q = ?\))
  - Outside the circle: 
    - +2.0 mC
    - -3.0 mC (Note: mC is milliCoulombs, a unit for measuring electric charge)

#### Problem Statement
The net electric flux passing through the Gaussian surface is given as \(+3.9 \times 10^8 \, \text{N} \cdot \text{m}^2/\text{C}\). 

Question: What is the value of the unknown charge within the Gaussian surface?

---

### Solution
To find the unknown charge (\( q \)), we use Gauss's Law which states:
\[ \Phi_E = \frac{q_{\text{enc}}}{\epsilon_0} \]
where:
- \(\Phi_E\) is the electric flux through the surface.
- \(q_{\text{enc}}\) is the total charge enclosed within the Gaussian surface.
- \(\epsilon_0\) is the permittivity of free space, \( \epsilon_0 = 8.85 \times 10^{-12} \, \text{C}^2/\text{N} \cdot \text{m}^2 \).

Given data:
- \(\Phi_E = +3.9 \times 10^8 \, \text{N} \cdot \text{m}^2 / \text{C} \)

Calculate the total enclosed charge (\( q_{\text{enc}} \)):
\[ q_{\text{enc}} = \Phi_E \cdot \epsilon_0 \]
\[ q_{\text{enc}} = (3.9 \times 10^8 \, \text{N} \cdot \text{m}^2/\text{C}) \times (8.85 \times 10^{-12} \, \text{C}^2/\text
Transcribed Image Text:### Example Problem for Applying Gauss's Law #### Instructions In each figure, the dashed circle represents the cross section of a closed Gaussian surface. #### Diagram Description In the provided diagram: - Several point charges are shown, both inside and outside the dashed circle (representing a Gaussian surface): - Inside the circle: - +2.0 mC (milliCoulombs) - +3.0 mC - + an unknown charge (labeled as \(q = ?\)) - Outside the circle: - +2.0 mC - -3.0 mC (Note: mC is milliCoulombs, a unit for measuring electric charge) #### Problem Statement The net electric flux passing through the Gaussian surface is given as \(+3.9 \times 10^8 \, \text{N} \cdot \text{m}^2/\text{C}\). Question: What is the value of the unknown charge within the Gaussian surface? --- ### Solution To find the unknown charge (\( q \)), we use Gauss's Law which states: \[ \Phi_E = \frac{q_{\text{enc}}}{\epsilon_0} \] where: - \(\Phi_E\) is the electric flux through the surface. - \(q_{\text{enc}}\) is the total charge enclosed within the Gaussian surface. - \(\epsilon_0\) is the permittivity of free space, \( \epsilon_0 = 8.85 \times 10^{-12} \, \text{C}^2/\text{N} \cdot \text{m}^2 \). Given data: - \(\Phi_E = +3.9 \times 10^8 \, \text{N} \cdot \text{m}^2 / \text{C} \) Calculate the total enclosed charge (\( q_{\text{enc}} \)): \[ q_{\text{enc}} = \Phi_E \cdot \epsilon_0 \] \[ q_{\text{enc}} = (3.9 \times 10^8 \, \text{N} \cdot \text{m}^2/\text{C}) \times (8.85 \times 10^{-12} \, \text{C}^2/\text
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