Question
The Piezoresistive effect is generally found in :
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CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
Semi Conductors
Piezoresistive Effect Explained
The Piezoresistive effect describes the change in electrical resistance of a material when mechanical stress is applied. This phenomenon is crucial for sensor technology.
Material Dependence of Piezoresistive Effect
The magnitude of the piezoresistive effect varies significantly across different types of materials:
- Semi Conductors: Exhibit a large piezoresistive effect. This is due to the significant changes in their band structure and carrier mobility under strain, which directly impacts resistance. Materials like silicon and germanium are widely used because of this pronounced effect.
- Conductors: Show a much smaller piezoresistive effect compared to semiconductors. While resistance does change with strain (often due to geometric changes and minor alterations in resistivity), it's generally less significant.
- Insulators: Typically display a negligible piezoresistive effect. Their electrical properties are not easily modulated by mechanical stress.
- Magnetic Materials: While some magnetic materials exhibit related effects (like magnetoresistance), the primary piezoresistive effect is most pronounced and utilized in semiconductors.
Conclusion on Piezoresistive Materials
Based on the significant change in electrical resistance under mechanical stress, the piezoresistive effect is generally found most prominently in Semi Conductors.
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