The resistivity of manganese wire of length 1 m is 1.84 × 10-6 ohm at 20°C. If the diameter of the wire is 3 x 10-4 m, what will be the resistance of the wire at that temperature ?
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Given-
R = 1 m is 1.84× 10-6 ohm~ at 20 degree Celsius.
D= 3×10-4 m = 26 m
R= ?
By the Formula-
R=R.ref( 1+ Alpha+T×T.ref)
1m=R×alpha.1+20 degree Celsius×T.ref)
R= Alpha 21×20!×T.ref
R=A×210×T.ref
R=A/T.Ref+210
210/10=50
R=A.T-50
A.T/R=50
R=50-A.T.
R= -50×A.T.
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