Advertisements
Advertisements
Question
Define the term 'conductivity' of a metallic wire. Write its SI unit.
Advertisements
Solution
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
RELATED QUESTIONS
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
Define the term 'electrical conductivity' of a metallic wire. Write its S.I. unit.
An electrolysis experiment is stopped and the battery terminals are reversed.
A heater coil is to be constructed with a nichrome wire (ρ = 1.0 × 10−6 Ωm) that can operate at 500 W when connected to a 250 V supply. (a) What would be the resistance of the coil? (b) If the cross-sectional area of the wire is 0.5 mm2, what length of the wire will be needed? (c) If the radius of each turn is 4.0 mm, how many turns will be there in the coil?
For a metallic conductor, what is the relation between current density (J), conductivity (σ) and electric field intensity (E)?
In Figure 3 given below, find the value of resistance x for which points A and B are at the same potential:
figure 3
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.
As the temperature of conductor increase, it's resistivity and conductivity change. The ratio of resistivity to conductivity.
