Water jet with a kink

Answer

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Objects can be charged by friction. Charged bodies exert a force on other charged objects.

But why is the water attracted by the charged rod?

a) The charged rod shifts the charges within the water. Consequently the opposite charges of the rod and the water are closer to each other than the identical ones. Therefore the plastic rod and the water attract each other.

b) The charge of the plastic is transferred to the water by electrostatic induction, so that it is charged identically now. Due to the fact that they are both charged identically now, the water is attracted.

c) The water is also charged electically because it is rubbing the metal tubes. Now the rod and the water attract each other becuase they are both charged.