1.11 Electric Dipole
Conceptual
1. The result below gives the electric field due to a dipole at an axial point
1 point
The result is valid for all points on the axis of the dipole
The result is valid for all points on the axis of the dipole where x is positive
The result is valid for all points on the axis of the dipole where x is positive and x > a
The result is valid for all points on the axis of the dipole where x > a or x < a
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2. The electric field at an equitorial point of a dipole is
1 point
Zero
In the direction of dipole moment
Opposite to the direction of dipole moment
Perpendicular to the direction of dipole moment
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3. Choose all the correct options
2 points
Dipole moment is a vector quantity
Dipole moment has direction but it is not a vector quantity
The direction of dipole moment is from ve charge to +ve charge
The magnitude of dipole moment is always Q(2a)
4. An electron and a proton are at a distance of 1 Angstrom. The moment of this dipole will be (C  m)
1 point
1.6 x 10^19
1.6 x 10^29
3.2 x 10^19
3.2 x 10^29
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5. The electric potential at a point on the axis of an electric dipole depends on the distance of the point from the dipole as
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r
1/r
1/r^2
1/r^3
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6. The electric field due to a dipole at a distance on its axis is
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Directly proportional to r^3
Inversely proportional to r^3
Directly proportional to r^2
Inversely proportional to r^2
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7. A region surrounding a stationary electric dipoles has
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Magnetic field only
Electric field only
Both electric and magnetic fields
No electric and magnetic fields
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8. The electric field due to an electric dipole at a distance r from its centre in axial position is E. If the dipole is rotated through an angle of 90° about its perpendicular axis, the electric field at the same point will be
1 point
E
E/4
E/2
2E
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