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CBSE Class 12-science Answered

what happens when an electric dipole is held in a non-uniform electric field? what will be the force on the torque when the dipole is held parallel or antiparallel to the field.
Asked by Balan | 26 Mar, 2018, 01:14: PM
answered-by-expert Expert Answer
Electric dipole will experience a torque when dipole vector is not parallel to electric field direction. The torque τ = p × E = pESinθ. when p and E are parallel then angle θ between the two vectors is zero, hence there will not be any torque.
Figure given above describes the situation when dipole is placed in a non uniform electric field.
Let us assume the field increase in the direction left to right in the figure.
If dipole is parallel to the direction of increasing field, as shown in figure there is a net force on electric dipole along the direction of increasing field.
In same way if dipole is antiparallel, there is a net force on dipole in the direction opposite to the direction of increasing field.
Answered by Thiyagarajan K | 29 Mar, 2018, 10:51: AM
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