Question

Energy of electric dipole in electric field in stable equilibrium – (A) Zero (B) -PE (C) +PE (D) 2PE​

Answer 1

Answer:

-pE

Explanation:

U = -pEcos(theta).. where theta us the angle between Electric field and dipole .. so when theta is 0 .. cos is maximum

Answer 2

Energy of electric dipole in electric field in stable equilibrium is -PE .

We know energy of dipole in electric field at an angle $\theta$ is given by :

$Energy=-\vec{P}.\vec{E}$

Here , p is dipole moment and E is electric field .

So ,

$Energy=-PEcos\ \theta$

We know , in stable equilibrium the Energy of electric dipole is minimum .

For this $\theta=0^o$ and $cos\ 0^o=1$ .

Putting this in above equation we get ,

$Energy =-PE$

Hence , this is the required solution .

Learn More :

Electrostatics

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