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Bending Water

Adjust a water faucet to produce a slow, non-turbulent, flow-stream, then charge a pocket comb by combing your hair, and position the teeth of the comb within a few centimeters (an inch or less) of the water stream. (Low to moderate humidity is required to do this experiment.)

The water stream will bend (curve) toward the comb. This bending occurs because the electrical field of the comb has what is called "divergence." That is, the electrical field intensity decreases as the distance from the comb increases. The water molecules, which are electrical dipoles, tend to orient themselves so that their dipoles are in line with the field lines of the comb's charge. Since the comb's field intensity decreases with distance, the ends of the water molecules that are closer to the comb will experience a greater force of attraction than the repulsion experienced by their opposite ends. In this tug-of-war, the comb-side charges win and the water flow departs from vertical.

bend-w1.gif

See the related article:
Water forms floating 'bridge' when exposed to high voltage
[Added 15 October 2007. Thanks to Thunderbolts.info Forum]