Electric Dipole

Three-point charges , and are placed at points , and , respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are:

1.	along direction
2.	along the line joining points and
3.	along the line joining points and
4.	along direction

An electric dipole is placed at an angle of with an electric field intensity . It experiences a torque equal to . The charge on the dipole, if the dipole length is , is:

1.		2.
3.		4.

The electric field at a point on the equatorial plane at a distance from the centre of a dipole having dipole moment is given by:
( separation of two charges forming the dipole, permittivity of free space)

1.		2.
3.		4.

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.

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.

Two point charges and are placed at a distance of as shown in the figure.

The magnitude of electric field intensity at a distance  varies as:

1.		2.
3.		4.

An electric dipole is placed at an angle of with an electric field of intensity . It experiences a torque equal to . If the dipole length is cm, calculate the magnitude of the charge on the dipole.

1.		2.
3.		4.