Task: Text Categorization
Input (English): Voigt developed a set of tensor equations to describe the linear behavior of materials exhibiting this effect, and a rank-3 tensor with 18 coefficients is used to describe materials with this property. Titanate salts of barium and lead are used in microphones because they exhibit this property, and Langevin developed a submarine detector that relied on this effect. This effect occurs in materials lacking a centre of symmetry and has an inverse effect called electrostriction. It was first observed by the Curie brothers in their studies of Rochelle salts. For 10 points identify this effect which sees the production of current in response to the application of a mechanical stress.
Output (English): Science