CHSE Class 12 Physics Quiz-1

By amohanty / November 12, 2024

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Quiz-1: Electric Charges and Electric Field

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The -ve and +ve charge 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

$\frac{\vec{p}}{4\pi\epsilon_0 y^3}$

$-\frac{\vec{p}}{4\pi\epsilon_0 y^3}$

$\frac{\vec{p}}{2\pi\epsilon_0 y^3}$

$-\frac{\vec{p}}{2\pi\epsilon_0 y^3}$

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The unit of electric permittivity in SI system is

$N m^2/{C^2}$

$N m/{C^2}$

$C/{N m^2}$

$C^2/{N m^2}$

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The ratio of the electric field intensity due to an electric dipole at an axial point to that at an equatorial point at the same distance from the centre is

$1:4$

$1:1$

$2:1$

$1:2$

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The force $F$ between charges $Q_1$ and $Q_2$ separated by distance $r$ is $25N$. If the force reduces to $5N$, the separation between them is

$\frac{r}{2}$

$\sqrt{5}r$

$\frac{r}{\sqrt{5}}$

$2r$

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Due to a point charge at the centre of a spherical Gaussian surface of diameter $a$, $10^6 Nm^2/C$ amount 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

$\sqrt{2}\times 10^6 Nm^2/C$

$2\sqrt{2}\times 10^6 Nm^2/C$

$10^6 /\sqrt{2} Nm^2/C$

$ 10^6 Nm^2/C$

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The law regarding the electrostatic force between two-point charges is

Gauss's law

Coulomb's law

Ampere's law

Faraday's law

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The dimension of electric permitivity is

$[M^{-1} L^3 T^4 A^{2}]$

$[M^{-1} L^{-3} T^4 A^{2}]$

$[M L^{-3} T^4 A^{2}]$

$[M L^3 T^4 A^{-2}]$

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The magnitude of force experienced by an electron placed at a point in the electric field $\vec{E}$ equals its weight $m\vec{g}$. The magnitude of $\vec{E}$ is

$e/{mg}$

$mge$

${mg}/e^2$

${mg}/e$

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The value of $\frac{1}{4\pi\epsilon_0}$ in SI unit is

$9\times 10^9 N m C^{-1}$

$9\times 10^9 N m^2 C^{-2}$

$10^9 N m^2 C^{-2}$

$9\times 10^9 N m C^{-2}$

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The dimension of electric flux is

$[M L T^{-2}A]$

$[M L^{3} T^{-3}A^{-1}]$

$[M^{-1} L^{-1} T^{3}A]$

$[M^{2} L T^{-2}A^{-2}]$

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