Some equipotential surfaces are shown in figure. The electric field at points A, B and C are respectively:

1. \(1 \mathrm{~V} / \mathrm{cm}, \frac{1}{2} \mathrm{~V} / \mathrm{cm}, 2 \mathrm{~V} / \mathrm{cm} \text { (all along +ve X-axis) }\)
2. \(1 \mathrm{~V} / \mathrm{cm}, \frac{1}{2} \mathrm{~V} / \mathrm{cm}, 2 \mathrm{~V} / \mathrm{cm} \text { (all along -ve X-axis) }\)
3. \(\frac{1}{2} \mathrm{~V} / \mathrm{cm}, 1 \mathrm{~V} / \mathrm{cm}, 2 \mathrm{~V} / \mathrm{cm} \text { (all along +ve X-axis) }\)
4. \(\frac{1}{2} \mathrm{~V} / \mathrm{cm}, 1 \mathrm{~V} / \mathrm{cm}, 2 \mathrm{~V} / \mathrm{cm} \text { (all along -ve X-axis) }\)

Subtopic:  Equipotential Surfaces |
 69%
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In a certain region of space with volume \(0.2\) m3, the electric potential is found to be \(5\) V throughout. The magnitude of electric field in this region is:
1. \(0.5\) N/C
2. \(1\) N/C
3. \(5\) N/C
4. zero

Subtopic:  Relation between Field & Potential |
 74%
From NCERT
NEET - 2020
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A short electric dipole has a dipole moment of  \(16 \times 10^{-9} ~\text{C-}\text{m}\). The electric potential due to the dipole at a point at a distance of \(0.6~\text{m}\) from the centre of the dipole situated on a line making an angle of \(60^{\circ}\) with the dipole axis is: \(\left( \frac{1}{4\pi \varepsilon_0}= 9\times 10^{9}~\text{N-m}^2/\text{C}^2\right)\)
1. \(200~\text{V}\)
2. \(400~\text{V}\)
3. zero
4. \(50~\text{V}\)

Subtopic:  Energy of Dipole in an External Field |
 66%
From NCERT
NEET - 2020
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The capacitance of a parallel plate capacitor with air as a medium is \(6~\mu\text{F}\). With the introduction of a dielectric medium, the capacitance becomes \(30~\mu\text{F}\). The permittivity of the medium is:\(\left(\varepsilon_0=8.85 \times 10^{-12} ~\text{C}^2 \text{N}^{-1} \text{m}^{-2}\right )\)

1. \(1.77 \times 10^{-12}~ \text{C}^2 \text{N}^{-1} \text{m}^{-2}\)
2. \(0.44 \times 10^{-10} ~\text{C}^2 \text{N}^{-1} \text{m}^{-2}\)
3. \(5.00 ~\text{C}^2 \text{N}^{-1} \text{m}^{-2}\)
4. \(0.44 \times 10^{-13} ~\text{C}^2 \text{N}^{-1} \text{m}^{-2}\)

Subtopic:  Dielectrics in Capacitors |
 61%
From NCERT
NEET - 2020
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Given below are two statements: 

Statement I: If the separation between two small electric dipoles is doubled without changing their relative orientation, the force between them becomes one eight of the initial value.
Statement II: On the equatorial position of an electric dipole, the potential is non-zero
 
1. Statement I is false but Statement II is true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is true but Statement II is false.

 
Subtopic:  Electric Potential |
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Given below are two statements: 

Statement I: The electric field lines are normal to a conducting surface.
Statement II: A conducting surface is an equipotential surface in equilibrium.
 
1. Statement I is false but Statement II is true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is true but Statement II is false.
Subtopic:  Equipotential Surfaces |
From NCERT
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Given below are two statements: 

Statement I: A sensitive electric equipment can be saved from the electric field by enclosing it inside a metallic shell.
Statement II: Electric field inside a metallic shell is zero provided that the shell does not enclose any charge.
 
1. Statement I is false but Statement II is true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is true but Statement II is false.

 
Subtopic:  Electrostatic Shielding |
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The insulation property of air breaks down at E = 3 × 106 V/m. The maximum charge that can be given to a sphere of diameter 5 m is approximately:

1.  2 ×10-5 C

2.  2 ×10-4 C

3.  2 ×10-3 C

4.  3 ×10-C 

Subtopic:  Dielectrics in Capacitors |
 65%
From NCERT
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A particle of mass 2 g and charge 1 μC is held at a distance of 1 m from a fixed charge of 1 mC. If the particle is released then its speed, when it is at a distance of 10 m from the fixed charge, is

1.  55 m/s

2.  100 m/s

3.  45 m/s

4.  90 m/s

Subtopic:  Electric Potential |
 63%
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The conducting shells A and B are arranged as shown below. If the charge on the shell B is q then electric flux linked with the spherical Gaussian surface S is

1.  qε0

2.  -q2ε0

3.  -qε0

4.  q2ε0

Subtopic:  Electric Potential |
 50%
From NCERT
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