An electric dipole of moment p is placed parallel to the uniform electric
field. The amount of work done in rotating the dipole by 90° is-
(i) 2pE
(ii) pE
(iii) pE/2
(iv) Zero
field. The amount of work done in rotating the dipole by 90° is-
(i) 2pE
(ii) pE
(iii) pE/2
(iv) Zero
Answers & Comments
Verified answer
[tex]{\huge{\underline{\underline{\boxed{\red{\mathscr{ Answer }}}}}}}[/tex]
When the dipole is rotated by 90°, the angle between the dipole moment and the electric field becomes 90°. Therefore, the amount of work done in rotating the dipole by 90 degrees from its initial position to a position perpendicular to the field is pE
(ii) option is correct
An electric dipole of moment p is placed parallel to the uniform electric field. The amount of work done in rotating the dipole by 90° is pE.
W = pE(cosθ^1 - cosθ^2)
θ1=0∘
θ2=90∘
W = pE(cos0∘-cos 90∘)
pE(1-0) = pE
Hence, option 2} is the correct answer.