An electric dipole of dipole moment p is aligned parallel to a uniform electric field E. The energy required to rotate the dipole by 90° is :

Question

An electric dipole of dipole moment p is aligned parallel to a uniform electric field E. The energy required to rotate the dipole by 90° is : (A)  p2 E  (B)  p E  (C) infinity (D)  p E2

Tardigrade Admin · Accepted Answer

W orkdone =Δ pE beginarrayl pE =- p E pE f =0 pE i =- pE Δ pE = pE endarray

Q. An electric dipole of dipole moment $p$ is aligned parallel to a uniform electric field $E$ . The energy required to rotate the dipole by $9 0^{\circ}$ is :

$p^{2} E$

$pE$

infinity

$p E^{2}$

W orkdone $= Δ pE$
$pE = - p E p E_{f} = 0 p E_{i} = - pE Δ pE = pE$

Q. An electric dipole of dipole moment p is aligned parallel to a uniform electric field E. The energy required to rotate the dipole by 90∘ is :

p2E

pE