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Which of the following is not a piezo-electric material?(a) quartz(b) rochelle salt(c) aluminium(d) barium titanate |
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Answer» Right choice is (a) quartz Easiest explanation: Aluminium is not a piezo-electric material. Quartz is the most stable natural crystal with high mechanical and thermal stability and has voulme resistivity higher than 10^4 ohm-cm and small internal electric loss. Barium titanate ceramic is a ferroelectric crystal and has small voltage output. |
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