In a normal conductor heat is generated at .a rate . Therefore a current-carrying conductor must dissipate heat effectively or it can melt or overheat the device in which it is used. Consider a long cylindrical copper wire of diameter 0.75 mm. If the wire can dissipate along its surface, what is the maximum current this wire can carry? 53.
(a) Compute the maximum current that a niobium wire 0.75 mm in diameter can carry at T = 4.2 K. (b) Compare your result in (a) with the copper wire of the same diameter described in Problem 52.
Reference of problem 52.
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