Torque on electric dipole placed in uniform electric field E is given as τ=pE‌sin‌θ.......(i) where, p= electric dipole moment and θ= angle measured with respect to direction of electric field. From Eq. (i), When θ=0∘⇒τ=pE‌sin‌0∘=0 When θ=‌
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⇒τ=pE‌sin‌
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=pE When θ=π⇒τ=pE‌sin‌π=0 When θ=‌
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⇒τ=pE‌sin‌
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=−pE When θ=2π⇒τ=pE‌sin‌2‌π=0 Hence, graph between τ and θ is given as