Certain crystals produce electric signals on application of pressure. This phenomenon is called
a. Pyroelectricity
b. Ferroelectricity
c. Peizoelectricity
d. Ferrielectricity
Ans. c
Explanation : When polar crystal is subjected to a mechanical stress, electricity is produced a case of piezoelectricity. Reversely if electric field is applied mechanical stress is developed. Piezoelectric crystal acts as a mechanical electrical transductor
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