1.11 Electric Dipole

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Conceptual

1. The result below gives the electric field due to a dipole at an axial point

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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

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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

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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)

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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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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

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E/4

E/2

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