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  4. I - V graph for a metal at temperatures t1, t2, t3 are given. Temperatures are related as

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Q. $I - V$ graph for a metal at temperatures $t_1, t_2, t_3$ are given. Temperatures are related asPhysics Question Image

COMEDKCOMEDK 2006Current Electricity

Solution:

Slope of the graph
$m = \frac{dI}{dV} = \frac{1}{R}$
$m_1 < m_2 < m_3$
or $R_1 > R_2 > R_3$
Resistance of metal wire increases with the increase in temperature.
HEnce , for same $V$ and $I , t_1 > t_2 > t_3$

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