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  4. I and V are respectively the current and voltage in a metal wire of resistance R. The I-V graph for the two different temperatures T1 and T2 given, then

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Q. $I$ and $V$ are respectively the current and voltage in a metal wire of resistance $R$. The $I-V$ graph for the two different temperatures $T_1$ and $T_2$ given, thenPhysics Question Image

COMEDKCOMEDK 2015Current Electricity

Solution:

Slope of line $=\frac{1}{R}$
or $R=\frac{1}{\text { slope }}$
$\because \text { (slope) } T _2<\text { (slope) } T _1 $
$\therefore R_2 > R_1$
Resistance of a metal wire increases with the temperature. So $T_2>T_1$