An electric dipole is placed at an angle of \(30^\circ\) with an electric field intensity \(2\times10^5~ \text{N/C}\). It experiences a torque equal to \(4 ~\text{N-m}\). The charge on the dipole, if the dipole length is \(2~ \text{cm}\), is:

1. \(8~\text{mC}\)  2. \(2~\text{mC}\)
3. \(5~\text{mC}\) 4. \(7~\mu \text{C}\)
Subtopic:  Electric Dipole |
 87%
From NCERT
NEET - 2016
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Three-point charges + q, -2q and +q are placed at points (x=0, y=a, z=0), (x=0, y=0, z=0) and (x=a, y=0, z=0), respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are:
 

1. 2qa along +y direction
2. 2qa along the line joining points (x=0, y= 0, z=0) and (x=a, y=a, z=0)
3. qa along the line joining points (x=0, y=0, z=0) and (x=a, y=a, z=0)
4. 2qa along +x direction
Subtopic:  Electric Dipole |
 84%
From NCERT
AIPMT - 2007
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An electric dipole is placed at the centre of a sphere. Which of the following statements is correct?

1. The electric flux through the sphere is zero.
2. The electric field is zero at every point on the sphere.
3. The electric field is zero at every point inside the sphere.
4. The electric field is uniform inside the sphere.
Subtopic:  Electric Dipole |
 69%
From NCERT
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The net dipole moment of the system is of the magnitude:
         

1.  q × 2a

2.  2q × 2a

3.  q × a

4.  2 × (2q × 2a)

Subtopic:  Electric Dipole |
 73%
From NCERT
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In a certain region of space, the electric field is along the z-direction throughout. The magnitude of the electric field is, however, not constant but increases uniformly along the positive z-direction, at the rate of 105 NC-1 per meter. What is the torque experienced by a system having a total dipole moment equal to 10-7 C-m in the negative z-direction? 

1. 10-2 Nm 2. 0
3. 10-1 Nm 4. 0.01 Nm
Subtopic:  Electric Dipole |
 67%
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The electric field at the equator of a dipole is \(E.\) If the strength of the dipole and distance are now doubled, then the electric field will be:

1. \(E/2\) 2. \(E/8\)
3. \(E/4\) 4. \(E\)
Subtopic:  Electric Dipole |
 67%
From NCERT
AIPMT - 1998
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An electric dipole is kept in a uniform electric field such that the dipole moment is not collinear with the electric field. It experiences:

1.  a force and torque.
2.  a force but no torque.
3.  a torque but no force.
4.  neither a force nor a torque.

Subtopic:  Electric Dipole |
 65%
From NCERT
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The electric field at a point on the equatorial plane at a distance \(r\) from the centre of a dipole having dipole moment P is given by:
(r >> separation of two charges forming the dipole, \(\epsilon_{0} =\) permittivity of free space) 

1. \(\vec{E}=\frac{\vec{P}}{4\pi \epsilon _{0}r^{3}}\) 2. \(\vec{E}=\frac{2\vec{P}}{\pi \epsilon _{0}r^{3}}\)
3. \(\vec{E}=-\frac{\vec{P}}{4\pi \epsilon _{0}r^{2}}\) 4. \(\vec{E}=-\frac{\vec{P}}{4\pi \epsilon _{0}r^{3}}\)
Subtopic:  Electric Dipole |
 61%
From NCERT
NEET - 2020
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An electric dipole is kept at the origin as shown in the diagram. The point A, B, C are on a circular arc with the centre of curvature at the origin. If the electric fields at A, B and C respectively are E1, E2, E3 , then which of the following is incorrect? \(\left ( d\gg l \right )\)

                
1.  E1 = -E3
2.  E1 = -2E2
3.  E1 = E3
4.  E3 = -2E2

Subtopic:  Electric Dipole |
 50%
From NCERT
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The figure shows electric field lines in which an electric dipole p is placed as shown. Which of the following statements is correct?
                      

1. The dipole will not experience any force.
2. The dipole will experience a force towards the right.
3. The dipole will experience a force towards the left.
4. The dipole will experience a force upwards.

Subtopic:  Electric Dipole |
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