A small doubt

The I-V characteristics of a metal wire at two temperatures is shown, then

a) T1>T2
b) T2>T1
c) T1=T2
d) The relation may vary

2 Answers

The slope here is giving the magnitude of conductance, i think. so Resistance at T1 is less than resistance at T2. so (b ).

R=R₀(I+K*âˆ‚T)
V₁/I₁<V₂/I₂ <FROM THE GRAPH)
R₁<R₂
R₀(I+K*âˆ‚T₁)<R₀(I+K*âˆ‚T₂)
WHERE âˆ‚T_i=T_i-T₀
THEREFORE FROM THE ABOVE RELATION
T₁<T₂

graphical analysis
M₁<M₂
WHERE M IS THE SLOPE
M_i=V_i/I_i

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