Question

Piezoelectric crystals produce an EMF when:

• A. an external mechanical force is applied to it
• B. an external magnetic field is applied
• C. a radiant energy stimulates the crystal
• D. the junction of two such crystals is heated

Hint:

Piezo = pressure. So piezoelectric materials respond to mechanical pressure by generating voltage — that's the piezoelectric effect!

Answer 1

The Correct Option is A

Piezoelectric crystals generate an electromotive force (EMF) when mechanical stress is applied to them.
This phenomenon is known as the piezoelectric effect.
When a mechanical force is exerted, the crystal lattice is deformed, causing a separation of electric charges.
This results in the generation of voltage across the crystal surfaces.
Other stimuli like magnetic fields, heat, or radiant energy do not produce this specific effect in piezoelectric materials.