1.

`E` denotes electric field in a uniform conductor, `I` corresponding current through it, `v_(d)` velocity of electrons and `P` denotes thermal power produced in the conductor, then which of the following graph is correct?A. B. C. D.

Answer» Correct Answer - C
(c ) `E = (iR)/(L) = (i. rho)/(A) = (n e Av d rho)/(A) implies v_(d) prop E` (Straight line)
`P = i^(2) R = ((EA)/(rho))^(2) R implies P prop E^(2)` (Symmetric parabola)
Also `P prop i^(2)` (parabola)
Hence, all graphs `a, b, c, d` are correct and `c` is incorrect.


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