Advertisements
Advertisements
प्रश्न
Define the term 'conductivity' of a metallic wire. Write its SI unit.
Advertisements
उत्तर
The property of a material that allows flows of electrons (or any charged particle ) between two points of the material when a potential difference is applied between these two points is called conductivity of a wire. SI unit of conductivity: Siemens per metre.
APPEARS IN
संबंधित प्रश्न
Using the concept of free electrons in a conductor, derive the expression for the conductivity of a wire in terms of number density and relaxation time. Hence obtain the relation between current density and the applied electric field E.
Define current density. Write an expression which connects current density with drift speed
An electrolysis experiment is stopped and the battery terminals are reversed.
For a metallic conductor, what is the relation between current density (J), conductivity (σ) and electric field intensity (E)?
What is the colour code of a carbon resistor having a resistance of 470 Ω and a tolerance of 5%?
Consider a current carrying wire (current I) in the shape of a circle.
Assertion: Bending a wire does not effect electrical resistance.
Reason: Resistance of wire is proportional to resistivity of material.
A man covers his body with a blanket of thickness 4 mm. His temperature is 37°C and that of the atmosphere is 27°C. If the coefficient of thermal conductivity of wool is 1.2 × 10-5 MKS units, heat lost by him per hour per square meter area is:
As the temperature of conductor increase, it's resistivity and conductivity change. The ratio of resistivity to conductivity.
