Opposites repel (Image: PBNJ/Getty)
OPPOSITES always attract, right? Not quite. A new experiment has shown that a drop of water with positive electrical charge can be made to “bounce off” a negatively charged object.
William Ristenpart of the University of California at Davis accidentally applied a strong electric field to a beaker filled with oil and water. At first the mixture erupted into a turbulent mess, but as he turned down the voltage Ristenpart saw droplets of water suspended in the oil bouncing between the electrode at the top of the beaker and the oil-water…
