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Q. No.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: Gauss's Law |
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NEET - 2023
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An electric dipole is placed at an angle of \(30^\circ\) with an electric field of intensity \(2\times 10^5 ~\mathrm{NC^{-1}}\). It experiences a torque equal to \(4~\mathrm{N-m}\). Calculate the magnitude of charge on the dipole, if the dipole length is \(2\) cm.
| 1. | \(2~\mathrm{mC}\) | 2. | \(8~\mathrm{mC}\) |
| 3. | \(6~\mathrm{mC}\) | 4. | \(4~\mathrm{mC}\) |
Subtopic: Electric Dipole |
68%
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: Gauss's Law |
80%
From NCERT
NEET - 2023
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A charge \(Q~\mu C\) 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. \(\frac{Q}{6\varepsilon_0}\times10^{-6}\)
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: Gauss's Law |
73%
From NCERT
NEET - 2023
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Two point charges \(\mathrm{-q}\) and \(\mathrm{+q}\) are placed at a distance of \(\mathrm{L},\) as shown in the figure.
The magnitude of electric field intensity at a distance \(\mathrm{R}(\mathrm{R}>>\mathrm{L})\) varies as:
The magnitude of electric field intensity at a distance \(\mathrm{R}(\mathrm{R}>>\mathrm{L})\) varies as:
| 1. | \(\frac{1}{\mathrm{R}^{6}}\) | 2. | \(\frac{1}{\mathrm{R}^{2}}\) |
| 3. | \(\frac{1}{\mathrm{R}^{3}}\) | 4. | \(\frac{1}{\mathrm{R}^{4}}\) |
Subtopic: Electric Dipole |
69%
From NCERT
NEET - 2022
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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: Electric Field |
61%
From NCERT
NEET - 2022
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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):
(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: Coulomb's Law |
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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: Electric Dipole |
63%
From NCERT
NEET - 2021
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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: Electric Dipole |
From NCERT
NEET - 2021
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A spherical conductor of radius 10 cm has a charge of \(3.2 \times 10^{-7}~\mathrm{C}\) distributed uniformly. What is the magnitude of the electric field at a point 15 cm from the center of the sphere?
1. 1.28 x N/C
2. 1.28 x N/C
3. 1.28 x N/C
4. 1.28 x N/C
Subtopic: Electric Field |
64%
From NCERT
NEET - 2020
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