The resistivity of a certain material is `0.6 Omegam`. The material is most likely to be:

The most resistant biological material is

Resistivity of a material depends on ......... of the material.

Two materials have the value of alpha_(1) and alpha_(2) as 6 xx 10^(-4) (""^(@) C )^(-1) and - 5 xx 10^(-4) (""^(@) C )^(-1) respectively. The resistivity of the first material rho_(20) = 2 xx 20^(-8) Omega. A new material is made by combining the above two materials. the resistivity does not change with temperature . The resistivity rho_(20) of the second material is .... Considering the reference temperature as 20^(@) C assume that the resistivity of the new material is equal to the sum of the resistivity of its component materials.

The rod given in the figure is made up of two different materials. Both have square cross sections of 3 mm side. The resistivity of the first material is 4xx10^(-3)Omega.m and it is 25 cm long while second material has resistivity of 5xx10^(-3)Omega.m and is of 70 cm long. What is the resistivity of rod between its ends?