Advertisements
Advertisements
Question
The product of resistivity and conductivity of a cylindrical conductor depends on ____________ .
Options
temperature
material
area of cross section
None of these
Solution
None of these
The relation between the resistivity ρ and conductivity σ of a material is given by
\[\rho = \frac{1}{\sigma}\]
\[ \Rightarrow \rho \times \sigma = 1\]
The product of conductivity and resistivity is unity. So, this product does not depend on any of the given quantities.
APPEARS IN
RELATED QUESTIONS
Consider a capacitor-charging circuit. Let Q1 be the charge given to the capacitor in a time interval of 10 ms and Q2 be the charge given in the next time interval of 10 ms. Let 10 μC charge be deposited in time interval t1 and another 10 μC charge be deposited in the next time interval t2.
As the temperature of a conductor increases, its resistivity and conductivity change. The ratio of resistivity to conductivity _______________ .
With reference to free-electron theory of conductivity, explain the terms:
(a) Drift speed
(b) Relaxation time
Consider an uncharged conducting sphere. A positive point charge is placed outside the sphere. The net charge on the sphere is then, ______.
