The resistivity is 1.68 x 10^-8 Ωm. Calculate the length of a copper wire with diameter 4.00 mm that has a resistance of 5.00 Ω. Ans: 3.74 km.
Solution
Given data are as below
Resistance of wire (R) =5
Radius of wire r=2.00mm
resistivity
The resistance of any wire can written as
Now then length of wire can be written as below formula
Now putting all values
So length of wire is 3.74Km
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