Home › Tamil Nadu HSC (Class 12) › Physics › Electrostatics › By Gauss's law, the total electric flux through …
By Gauss's law, the total electric flux through a closed surface enclosing a net charge $Q_{enc}$ is
A$Q_{enc}\,\varepsilon_0$
B$\dfrac{Q_{enc}}{\varepsilon_0}$
C$\dfrac{\varepsilon_0}{Q_{enc}}$
D$\dfrac{Q_{enc}}{4\pi\varepsilon_0}$
Answer & Solution
Correct answer: B. $\dfrac{Q_{enc}}{\varepsilon_0}$
1. Gauss's law: $\displaystyle\oint \vec{E}\cdot d\vec{A} = \dfrac{Q_{enc}}{\varepsilon_0}$.
2. The flux depends only on the **enclosed** charge, not on the shape or size of the surface or where the charge sits inside.
3. Charges outside the surface contribute zero net flux.
_Source: Samacheer Kalvi Class 12 Physics Vol.1, Unit 1 'Electrostatics', §1.6 (Gauss law) / Long Answer Q.11_
Related questions
How is the magnitude of the electric field at a point defined?Two positive charges of equal magnitude are fixed a short distance apart. A positive test An isolated negative point charge sits alone in space. Which way do its electric field linThe separation between two point charges is doubled while the charges themselves stay the Two small spheres both carry negative charge and are held near each other. What do they doExcess charge is placed on a metal sphere standing on an insulating stand. Where does thatHow does a neutral object become negatively charged?On the axial line of a short dipole the electric field is $E_a$, and on the equatorial lin