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What is Resistivity? Video Lecture | Physics for JEE Main & Advanced

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FAQs on What is Resistivity? Video Lecture - Physics for JEE Main & Advanced

1. What is resistivity?
Ans. Resistivity is a measure of a material's ability to resist the flow of electric current. It is a fundamental property of a material and is denoted by the symbol "ρ" (rho). Resistivity is the reciprocal of conductivity, which measures a material's ability to conduct electric current.
2. How is resistivity different from resistance?
Ans. Resistivity and resistance are related but different concepts. Resistance is a property of an object or component, while resistivity is a property of the material itself. Resistance depends on the dimensions and shape of the object, while resistivity is an intrinsic property of the material and remains constant regardless of the object's shape or size.
3. What factors affect the resistivity of a material?
Ans. The resistivity of a material depends on several factors, including the type of material, its temperature, and impurities present. Generally, metals have low resistivity due to their high electrical conductivity, while insulating materials have high resistivity. Temperature also affects resistivity, as most materials experience an increase in resistivity with temperature.
4. How is resistivity measured?
Ans. The resistivity of a material is typically measured using a four-point probe technique. This involves passing a known current through the material using two outer probes and measuring the voltage drop across the inner two probes. By applying Ohm's Law (V=IR), the resistivity can be calculated using the measured voltage and current values.
5. What are some real-life applications of resistivity?
Ans. Resistivity plays a crucial role in various practical applications. It is used in the design and analysis of electrical conductors, such as wires and cables, to ensure efficient transmission of electricity. Resistivity measurements are also utilized in the characterization of semiconductors, superconductors, and other electronic materials. Additionally, resistivity is essential in the field of geophysics, where it helps in mapping and studying the subsurface properties of the Earth.
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