Which outcome occurs when a high-frequency voltage is applied to a piezoelectric crystal within a capacitance proximity sensor?

💡 Explanation

When high frequency is applied, the piezoelectric crystal within a properly designed capacitance proximity sensor experiences resonant mechanical oscillations due to inverse piezoelectric effect, generating a detectable electric field coupled with capacitance variations. Therefore, resonant induced electric field generation results, rather than resistance increase, crystal fracture, or overheating which involve different failure modes or operating conditions.

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