Dipole in a uniform external field

The video tutorial explains the concept of a uniform electric field, where the field strength is consistent at every point. It discusses the behavior of a permanent dipole in such a field, highlighting that the net force on the dipole is zero, but a torque is present due to the separation of charges. The torque's magnitude is determined by the forces and their perpendicular distance. In non-uniform fields, the net force is non-zero, and the dipole experiences a force depending on its orientation relative to the field. The video also covers vector notation for torque and the conditions under which the net torque is zero.

What is a characteristic of a uniform electric field?

• The field strength is the same at every point.

• The field strength is zero everywhere.

• The field strength depends on the dipole moment.

• The field strength varies at different points.

In a uniform electric field, what is the net force on a dipole?

• It is zero.

• It is equal to the dipole moment.

• It is equal to the charge of the dipole.

• It is equal to the electric field strength.

How is torque on a dipole in a uniform field calculated?

• By multiplying the dipole moment by the electric field strength.

• By multiplying the charge by the distance between charges and the sine of the angle.

• By adding the forces on the charges.

• By dividing the electric field by the dipole moment.

What happens to a dipole in a non-uniform electric field when it is parallel to the field?

• It experiences a force in the direction of the decreasing field.

• It experiences a torque only.

• It experiences no force.

• It experiences a force in the direction of the increasing field.

When is the net torque on a dipole zero in a non-uniform field?

• When the dipole is parallel or antiparallel to the field.

• When the dipole is at a 45-degree angle to the field.

• When the dipole is not influenced by the field.

• When the dipole is perpendicular to the field.