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The phenomena, where the pollutants pass...

The phenomena, where the pollutants pass in higher concentration through the food cahin and accumulate to the maximum in the final consumer is called

A

Eutrofication

B

Biogeochemical sycle

C

Biological magnification

D

Biological degradation

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The correct Answer is:
(c)
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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

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