Question

What is meant by polar conductance ?

Answer 1

It seems that you are asking molar conductance.
Molar conductance ($\Lambda$_m ) is defined as the conductance caused by all the ions present in 1M (1 Molar) and 1cm³ volume solution where electrodes are placed at a distance of 1 cm and area of the cross section is large enough to accomodate the total solution.
$\Lambda$_m = $\frac{1000\times k}{M}$
where k is specific conductivity and M is molarity.
while,
Equivalent conductance ($\Lambda$_eq) is defined as conductance caused by all the ions present in 1N (1 Normal) and 1cm³ volume solution where electrodes are placed at a distance of 1 cm and area of the cross section is large enough to accomodate the total solution.
$\Lambda$_eq = $\frac{1000\times k}{N}$
where k is specific conductivity and N is normality.