Question

An electric dipole of dipole moment P is placed perpendicular to electric lines of force of electric field E, then the work done in slowly deflecting it through an angle of 180°



Read the question thoroughly and then answer it, please !

Answer 1

Explanation:

hope it helps you please mark me brainlist please

Answer 2

Concept:

The electric dipole moment is a measure $\theta _1$of the separation of negative and positive electrical charges within a system.

Given:

An electric dipole of dipole moment P is placed perpendicular to electric lines of force of electric field E.

Find:

The work done in slowly deflecting it through an angle of 180°.

Solution:

The work done required to rotate an electric dipole in an external uniform electric field from the angle $\theta _1$ to $\theta _2$ is:

$W=pE(cos \theta _1-cos\theta _2)$ where $p,E$ are the dipole moment and electric field respectively.

When the electric dipole is placed normal to the field, the angle between them is $\theta _1=90^o$.

When the dipole is slowly deflected through an angle of $180^o$ , the angle between the dipole and the field is :

$\theta _2=180^o$

Therefore, the work done is :

$W=pE(cos \theta _1-cos\theta _2)\\W=pE(cos (90^o)-cos (270^o))\\W=pE(0-(-1))\\W=pE$

The work done in slowly deflecting it through an angle of $180^o$ is $pE$ .

#SPJ3