15. An electric dipole with a dipole moment p is within a uniform electric field E. If the electric dipole is at an angle of 60° to the electric field, what is the external work needed to rotate the electric dipole to be perpendicular to the electric field?
(A)
pE
(B) -
pE
(C)
pE
(D) -
pE
(E) (1-
)pE
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