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The ability of certain ultra cold substa...

The ability of certain ultra cold substances to conduct electricity without resistance is called

A

Semiconductor

B

Conductor

C

Superconductor

D

Insulator

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If a current passes through a metal conducting wire of area of cross section A, the drift velocity of free electrons inside the metal is v_d=1/( n e A) , where the amount of electric charge of an electron =e and the number of free electrons per unit volume of the metal=n. The applied electric field on the wire is E=V/l , where a potential difference V exists between two points, l apart, along the length of the wire. IF R is the resistance of the wire between those two points, then the resistivity of its material is rho=(RA)/l .Besides the mobility (mu) of the free electrons inside a wire is defined as their drift velocity for a unit applied electric field. The current through unit cross section of a conductor,called the electric current density J, is related with the applied electric field E as