A pair of equal and opposite charges of 0.01 C separated by 1.5 cm are placed in

Question

A pair of equal and opposite charges of 0.01 C separated by 1.5 cm are placed in an Electric Field (E of strength 3500 N/C as shown in the diagram.
Considering the situation above, answer the following true, false, greater than, less than or equal to questions.
                                                                                                                                 The potential energy of the dipole is minimum and equal to 0 when the moment and the electric field are in the same direction.
                                                                                                                              The dipole moment points from the positive to the negative charge.
                                                                                                                              Work is done by the field on the dipole, in rotating it from an angle of 90 degrees to an angle of 30 degrees.
                                                                                                                              The torque on the dipole points out of the plane of the paper.
                                                                                                                                 If allowed to rotate about its center, the dipole would swing clockwise.

Explanation / Answer

1) The potential energy of the dipole is minimum and equal to 0 when the moment and the electric field are in the same direction        - true        potential energy of dipole in a uniform electrioc field is                         U = P E cos ?       ; ?= 90^ o                              = 0 2) The dipole moment points from the positive to the negative charge. - False
    the electric dipole moment points from the negative charge towards the positive charge 3) Work is done by the field on the dipole, in rotating it from an angle of 90 degrees to an angle of 30 degrees   True                          The torque on the dipole points out of the plane of the paper. False
                                       4)If allowed to rotate about its center, the dipole would swing clockwise. True             

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