V-i graph for carbon at temperatures T1 and T2 as shown in figure where.

tan⁡θ=iV=1R;tan⁡θα1R;θ1>θ2;R1 T2

V-i graph for carbon at temperatures T1 and T2 as shown in figure where.

tan⁡θ=iV=1R;tan⁡θα1R;θ1>θ2;R1 T2

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V-i graph for carbon at temperatures T₁ and T₂ as shown in figure where.

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No relation

T₁ > T₂

T₁ = T₂

T₁ < T₂

answer is C.

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Detailed Solution

$\tan θ = \frac{i}{V} = \frac{1}{R}; \tan θα \frac{1}{R}; θ_{1} > θ_{2}; R_{1} < R_{2}; Temperature coefficient of carbon is negative . So, T_{1} > T_{2}$

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V-i graph for carbon at temperatures T1 and T2 as shown in figure where.

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V-i graph for carbon at temperatures T₁ and T₂ as shown in figure where.