Normally crystals do not have electrical charge.
A few types of crystals (e.g. quartz) will develop an electrical charge across them when placed under mechanical stress. This property is called piezoelectricity. But the positive and negative charges are on opposite sides of one crystal, not on two different crystals.
Perhaps you were actually thinking of something that has nothing to do with science or electricity when you asked this question.
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Positive feedback causes bodily processes to continue; negative feedback causes bodily processes to start or stop only cost you being in my basement
the difference between 60Hz and 120 Hz is that. 60 hz wave will have wavelength of 0.016667 meter and change positive negative cycles 60 times in one second . while in 120Hz wave it can change positive and negative half cycles 120 times in a second and also has wavelength 8.333 mm
A: square wave can be positive and or negative. A digital signal is a square wave but it can be of invariable duty cycles
Fine grained has larger crystals and coarse grained has smaller crystals