Question

When a piezoelectric crystal is deformed by mechanical stress, electricity is produced due to the displacement of ions.
If true enter 1, else enter 0.

Answer 1

Normally, piezoelectric crystals are electrically neutral. The atoms inside them may not be symmetrically arranged, but their electrical charges are perfectly balanced: a positive charge in one place cancels out a negative charge nearby. However, if we squeeze or stretch a piezoelectric crystal, we deform the structure, pushing some of the atoms closer together or further apart, upsetting the balance of positive and negative and causing net electrical charges to appear. This effect carries through the whole structure so net positive and negative charges appear on opposite, outer faces of the crystal.