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If $$\oint_s \vec{E} \cdot \overrightarrow{d S}=0$$ over a surface, then:

 1 the electric field inside the surface is necessarily uniform. 2 the number of flux lines entering the surface must be equal to the number of flux lines leaving it. 3 the magnitude of electric field on the surface is constant. 4 all the charges must necessarily be inside the surface.
Subtopic: Â Gauss's Law |
Â 78%
From NCERT
NEET - 2023
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An electric dipole is placed at an angle of $$30^\circ$$ with an electric field of intensity $$2\times 10^5 ~\text{NC}^{-1}$$. It experiences a torque equal to $$4~\text{N-m}$$. Calculate the magnitude of charge on the dipole if the dipole length is $$2~\text{cm}$$.
 1 $$2~\text{mC}$$ 2 $$8~\text{mC}$$ 3 $$6~\text{mC}$$ 4 $$4~\text{mC}$$
Subtopic: Â Electric Dipole |
Â 71%
From NCERT
NEET - 2023
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According to Gauss law of electrostatics, electric flux through a closed surface depends on:
 1 the area of the surface 2 the quantity of charges enclosed by the surface 3 the shape of the surface 4 the volume enclosed by the surface
Subtopic: Â Gauss's Law |
Â 81%
From NCERT
NEET - 2023
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A charge $$Q~\mu\text{C}$$ is placed at the centre of a cube. The flux coming out from any one of its faces will be: (in SI unit)
 1 $$\frac{Q}{\varepsilon_0}\times10^{-6}$$ 2 $$\frac{2Q}{3\varepsilon_0}\times10^{-3}$$ 3 $$\frac{Q}{6\varepsilon_0}\times10^{-3}$$ 4 $$\frac{Q}{6\varepsilon_0}\times10^{-6}$$
Subtopic: Â Gauss's Law |
Â 74%
From NCERT
NEET - 2023
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Two point charges $${-q}$$ and $${+q}$$ are placed at a distance of $${L},$$ as shown in the figure.

The magnitude of electric field intensity at a distance $${R}~({R}>>{L})$$ varies as:
 1 $$\frac{1}{{R}^{6}}$$ 2 $$\frac{1}{{R}^{2}}$$ 3 $$\frac{1}{{R}^{3}}$$ 4 $$\frac{1}{{R}^{4}}$$
Subtopic: Â Electric Dipole |
Â 70%
From NCERT
NEET - 2022
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NEET 2023 - Target Batch - Aryan Raj Singh
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Twelve point charges each of charge $$q$$ C are placed at the circumference of a circle of radius $$r$$ m with equal angular spacing. If one of the charges is removed, the net electric field (in N/C) at the centre of the circle is:
($$\varepsilon_0$$-permittivity of free space)
1. $$\frac{13q}{4\pi \varepsilon_0r^2}$$
2. zero
3. $$\frac{q}{4\pi \varepsilon_0r^2}$$
4. $$\frac{12q}{4\pi \varepsilon_0r^2}$$

Subtopic: Â Electric Field |
Â 62%
From NCERT
NEET - 2022
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NEET 2023 - Target Batch - Aryan Raj Singh
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The ratio of coulomb's electrostatic force to the gravitational force between an electron and a proton separated by some distance is $$2.4\times 10^{39}$$. The ratio of the proportionality constant, $$K=\frac{1}{4\pi\varepsilon_0}$$ to the gravitational constant $$G$$ is nearly:
(Given that the charge of the proton and electron each $$=1.6\times 10^{-19}$$, the mass of the electron = $$9.11\times 10^{-31}$$ kg, the mass of the proton $$=1.67\times 10^{-27}$$ kg):
 1 $$10^{20}$$ 2 $$10^{30}$$ 3 $$10^{40}$$ 4 $$10$$
Subtopic: Â Coulomb's Law |
Â 60%
From NCERT
NEET - 2022
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Polar molecules are the molecules:

 1 that acquires a dipole moment only when the magnetic field is absent. 2 has a permanent electric dipole moment. 3 has zero dipole moment. 4 that acquire a dipole moment only in the presence of an electric field due to displacement of charges.
Subtopic: Â Electric Dipole |
Â 64%
From NCERT
NEET - 2021
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NEET 2023 - Target Batch - Aryan Raj Singh
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A dipole is placed in an electric field as shown. In which direction will it move?

 1 towards the left as its potential energy will decrease. 2 towards the right as its potential energy will increase. 3 towards the left as its potential energy will increase. 4 towards the right as its potential energy will decrease.
Subtopic: Â Electric Dipole |
From NCERT
NEET - 2021
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NEET 2023 - Target Batch - Aryan Raj Singh
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A spherical conductor of radius $$10~\text{cm}$$ has a charge of $$3.2 \times 10^{-7}~\text{C}$$ distributed uniformly. What is the magnitude of the electric field at a point $$15~\text{cm}$$ from the center of the sphere? $$\frac{1}{4\pi \varepsilon _0} = 9\times 10^9~\text{N-m}^2/\text{C}^2$$
1. $$1.28\times 10^{5}~\text{N/C}$$
2. $$1.28\times 10^{6}~\text{N/C}$$
3. $$1.28\times 10^{7}~\text{N/C}$$
4. $$1.28\times 10^{4}~\text{N/C}$$

Subtopic: Â Electric Field |
Â 64%
From NCERT
NEET - 2020
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