Stream of water deflected
The positive charged ruler produces an electric field. In this field the dipole molecules of the water are partly orientated: there negative poles are pointing towards the center of the positive field.
The distance between opposite charges is a little shorter than between like charges. Because of the fact that the strength of the force depends from the distance - the closer, the bigger - the attracting force overbalances the repelling.
So the stream of water is deflected.