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A wire of length 1 m and radius 10^(-3) ...

A wire of length 1 m and radius `10^(-3)` m is carrying a heavy current and is assumed to radiate as a black body. At equilibrium its temperature is 900 K while that of the surroundings is 300 K. The resistivity of the material of the wire at 300 K is `pi^2xx10^(-8)Omega-m` and its temperature coefficient of resistance is `7.8xx10^(-3)per@_C` (Stefan's constant `=5.68xx10^(-8)W-m^2-K^4)`. So, the current in the wire is

A

a)25 A

B

b)15 A

C

c)21 A

D

d)36 A

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