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Dipoles in external electric fields: torque


A uniform electric field in the +y direction is turned on in a region where a dipole is placed with its dipole moment in the same direction.
The dipole is then very slowly rotated in the anticlockwise direction.
How does the torque experienced by the dipole, τ, due to the electric field change with the angle of rotation, θ?
Note: A negative τ indicates a reversed direction.
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