Question

A dipole of dipole moment p is present in a uniform electric field E . Write the value of the angle between p and E for which the torque experienced by the dipole, is minimum.

Answer 1

torque =pESin180 degree .......in this situation torque is minimum... when angel is 180 ...electric field line doesn't pass through them.... plz follow me

Answer 2

Concept:

Positive and negative charges in any electromagnetic system are separated by an electric dipole.

The physical field that surrounds electrically charged particles and pulls or attracts all other charged particles in the vicinity is known as an electric field.

Given:

A dipole of Dipole moment is $\vec{P}$ is present in a uniform electric field $\vec{E}$ .

Find:

The angle between $\vec{P}$ and $\vec{E}$ when the torque experienced by the dipole is minimum.

Solution:

The torque between the dipole moment and the electric field be $\tau$.

The torque experienced can be given by:

$\tau =qEP\\\tau =qE(2l{sin\theta })$

$\tau =PEsin\theta$

When torque is minimum,

$\tau _{min}=0$

$\theta=0^o$

Therefore,

$\tau =PEsin\theta\\\tau =PEsin(0^o)\\\tau =0$

The angle between the dipole moment and the electric field when torque experienced is minimum is $0^o$.

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