The product of conductivity and resistivity of a conductor
depends on pressure applied
depends on current flowing through conductor
is the same for all conductors
varies from conductor to conductor
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-1 – 2015
By definition, conductivity is the reciprocal of resistivity ($\sigma = 1/\rho$). Therefore, the product of conductivity and resistivity is always equal to 1 ($\sigma \times \rho = (1/\rho) \times \rho = 1$). This relationship holds true for all materials, regardless of whether they are conductors, insulators, or semiconductors, and it is independent of the physical conditions like pressure or the current flowing through the conductor (assuming the material obeys Ohm’s Law).