Electric Charges and Fields

1. The electrostatic force between two charges a distance $r$ apart in a vacuum is $F$. The force between the same charges a distance $r/2$ apart in a medium of dielectric constant $2$ is
2. If $F_e$ and $F_g$ are the electric and gravitational forces respectively between an electron and proton situated at a distance apart, the ratio of $F_e$ and $F_g$ is of the order of
3. The dimension of electric flux is
4. The magnitude of force experienced by an electron placed at a point in the electric field $\vec{E}$ is equal to its weight $m\vec{g}$. The magnitude of $\vec{E}$ is
5. The value of $\frac{1}{4\pi\epsilon_0}$ in SI unit is
6. The SI unit of electric dipole moment is
7. The law regarding lectrostatic force between two point charges is
8. A charge $q$ is placed at the centre of a cube. The electric flux through one of its faces is
9. Force $\vec{F}$ between two charges $Q_1$ and $Q_2$ separated by $r$ is $25N$. It can be reduced to $5N$ if the separation between them is made
10. Due to presence of a point charge at the centre of a spherical Gaussian surface of diameter $a$, $10^6 Nm^2/C$ ammount of electric flux passes through it. Keeping the point charge at the centre, the Gaussian surface is changed to a cubical Gaussian surface of side $a$. The flux through the new Gaussian surface will be
11. The electric field intensity near a uniformly charged infinite plane thin non-conducting sheet with charge density $+\sigma$ placed in air is
12. The SI unit of volume charge density is
13. The electric field inside a thin spherical shell of radius $R$ and uniform surface charge density $\sigma$ is
14. The negative and positive charges of a dipole of dipole moment $\vec{p}$ are placed respectively at points $\hat{i}a$ and $+\hat{i}a$. If $y>>a$, then the electric field intensity due to the dipole at the point located at $\hat{j}y$ is
15. The charge on a body is always an integral multiple of a basic quantum of charge $(e)$. This propery of electric charge is called
16. The dimension of electric permitivity is
17. The value of the permitivity of free space ($\epsilon_0$) in SI units is
18. The ratio of electric field intensity due to an electric dipole at an axial point to that at an equatorial point at the same distance from centre is
19. A proton at rest has charge $e$. When it moves with a high speed, its charge
20. The electric field due to an electric dipole at a distance $r$ from its centre is directly proportional to

 

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