Question

1. An electric dipole of dipole moment p is located in
a region of uniform electric field E making an angle
q to the field. The dipole is to be rotated by 180°
from the initial position of dipole. Then work done by
external agent is
(1) PE cosa
(2) 2pE cosa
(3) 2pE sing
(4) -2pE cosa​

Answer 1

When displace datan angle theta,from its mean position the magnitude of restoring torqueis τ=−Psinθ

For small angular displacements in θ≈θ

τ=−PEθ

α= τ ÷ I =− PEθ ÷ I =−w × w (θ)

w×w =(PE/I)

T=2π (IP/E)

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