The torque acting on a dipole moment p placed in an electric field E is 

1
\(\vec{\tau }=\vec{p}\div \vec{E}\)
2
\(\vec{\tau }=\vec{p}-\vec{E}\)
3
\(\vec{\tau }=\vec{p}+\vec{E}\)
4
\(\vec{\tau }=\vec{p}\times \vec{E}\)

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