Question

The specific resistance of platinum at o0c is 10.5.what should be the length of platinum wire of no.32swg to have resistance of 3ohm at 00c

Answer 1

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Answer 2

Here R0=5Ω, 

R100=5.23Ω,Rt=5.795Ω

As α=R0×tR100−R0

∴t=R100−R0Rt−R0×100

=5.23−55.795−5×100

=346.65∘C