Question

(i) What is specific conductivity? What is its relation with specific resistance? What is its unit?
(ii) Write Ohm's law?

Answer 1

(i) Specific conductivity: The reciprocal of resistivity is called specific conductivity. It is defined as the conductance between the opposite faces of one centimeter cube of a conductor. It is denoted by k (kappa).
$k=\frac{1}{\rho }$
The unit of specific conductivity is
$k=\frac{1}{ohmcm}=oh{m}^{-1}c{m}^{-1}$
The specific conductivity of a solution at a given dilution is the conductance of one cm cube of the solution. It is represented by k(kappa).
Note: The specific conductivity of a solution of electrolyte depends upon the dilution or molar concentration of the solution.
(ii) Ohm's law: The strength of current flowing through a conductor is directly proportional to the potential difference applied across the conductor and inversely proportional to resistance of the conductor.
$V\propto I$
$V=RI$
$R=\frac{V}{I}$
R is a constant R = Resistance