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Q.

E denotes electric field in a uniform conductor, I corresponding current through it, vd drift velocity of electrons and P denotes thermal power produced in the conductor, then which of the following graph is incorrect

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a

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b

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c

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d

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answer is C.

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Detailed Solution

E=iRL=neAvdρA⇒vd∝E (Straight line)
P=i2R=EAρ2R⇒P∝E2 (Symmetric parabola) 
Also P∝i2 (parabola) 
Hence all graphs a, b, d are correct and c is incorrect

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