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Physics
Physics
Problem
Show that the work done by an external agent in rotating an electric dipole slowly from an initial angle
θ
1
\theta_1
θ
1
to a final angle
θ
2
\theta_2
θ
2
in a uniform electric field of magnitude
E
E
E
is
W
=
p
E
(
cos
θ
1
−
cos
θ
2
)
,
W = pE\,(\cos\theta_1 - \cos\theta_2),
W
=
pE
(
cos
θ
1
−
cos
θ
2
)
,
where
p
p
p
is the dipole moment.
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