Abstract
A method for producing water drops with very small net charge (few fC) was employed in conjunction with a sensing device, in order to identify the electric signals produced by falling water drops. The sensing device consists of a wire loop hooked to a patch-clamp amplifier set into voltage-clamp mode. Water drops with very small net charge produce a negligible signal at the sensing device but when falling through a horizontal charged capacitor they produce well-defined and reproducible signals which are proportional to the capacitor voltage. The experimental curves can be fitted to the theoretical ones considering the drop as possessing a multipolar charge distribution. There is evidence that this distribution is due to the contribution of the field-oriented water molecules multipoles.
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