In particular, note that the torque is zero when the dipole and electric field vectors are parallel. Thus, a dipole will always experience a torque that tends to align it with the electric field vector. The dipole is thus in a stable equilibrium when it is parallel to the electric field.
What happens when electric dipole is parallel to electric field?
Once the dipole comes parallel to the electric field vector a force will act on the dipole in the direction of increasing field. … Maximum torque acts on a dipole when the angle between P and E is maximum i.e. θ=90∘and its minimum when θ=0∘ in a uniform electric field. Note: Option C.
What is the equilibrium condition of dipole in a uniform electric field?
The dipole is in constant equilibrium if θ = 0. A dipole in stable equilibrium, when Electric filed and dipole moment are perpendicular to each other i.e. the angle between them is zero degrees and torque will be maximum.
When the dipole is aligned itself parallel to the uniform electric field then the torque on the dipole is?
(i) Parallel to the field: The net force and torque on the dipole is zero. Hence, dipole will not move.
What does an electric dipole experience?
An electric dipole always experiences a torque when placed in uniform as well as non-uniform electric field. But in non-uniform electric field, dipole will also experience net force of attraction. So the electric dipole in non-uniform electric field experiences both torque and force.
What happens when an electric dipole?
Electric dipole will experience a torque when dipole vector is not parallel to electric field direction. … when p and E are parallel then angle θ between the two vectors is zero, hence there will not be any torque.
What will happen if dipole is kept in non uniform electric field?
If an electric dipole is placed in a nonuniform electric field, then the positive and the negative charges of the dipole will experience a net force. And as one end of the dipole is experiencing a force in one direction and the other end in the opposite direction, so the dipole will have a net torque also.
At what position is the electric dipole in uniform electric field?
Even if we change the orientation, the length and the charge of the dipole, the net force on the dipole will be equal to zero. Hence, the electric force on a dipole when it is placed in a uniform electric field is always zero.
What is the relation between electric field and potential?
The relationship between potential and field (E) is a differential: electric field is the gradient of potential (V) in the x direction. This can be represented as: Ex=−dVdx E x = − dV dx . Thus, as the test charge is moved in the x direction, the rate of the its change in potential is the value of the electric field.
What is the effect of torque on a dipole in an electric field?
Answer: Even though the two forces on the ends of the dipole cancel as free vectors, they act at different points. This means that they give rise to a torque on dipole. The turning effect of this torque is to reduce the angle q towards zero, and make the dipole moment vector become parallel to the field.
Is it possible a dipole is placed in uniform electric field but it doesn’t rotate?
When a dipole is placed in a uniform electric field and dipole vector direction is not parallel to field direction, each chargs of dipole experiences a force. Magnitude of the two forces are equal but in opposite direction. … Hence in uniform field, dipole experiences only torque.
Why does a dipole rotate in an electric field?
1: A dipole in an external electric field. (a) The net force on the dipole is zero, but the net torque is not. As a result, the dipole rotates, becoming aligned with the external field. … The forces on the two charges are equal and opposite, so there is no net force on the dipole.