SSC JE Electrical Engineering 2013 Paper

Temperature coefficient of copper at 20°C is 0.00393°C.
$\mathrm{R}={\mathrm{R}}_{\mathrm{ref}}\left(1+\mathit{d}\left(\mathrm{T}-{\mathrm{T}}_{\mathrm{ref}}\right)\right]$
R = Conductor resistance at temperature T
d = Temperature coefficient of resistance of conducing material
T = Conductor temperature in degree
Tref = Reference temperature for 'd' is specifies