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Mr. Dubey • 52.30K Points
Coach 

Q. Quartz crystal and tourmaline used in oscillators work on the principle of:

(A) photo electric effect
(B) piezo electric effect
(C) raman effect
(D) black body radiation
Correct : Option (B)

Explanation: 
 quartz crystals work on the principle of piezo electric effect. when electrical energy is applied to these crystals, they vibrate in a direction perpendicular to the application of energy producing oscillations.

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