Q. 154.1( 16 Votes )

A copper wire has

Answer :

(a) From the given information,

Radius of wire, r =

Then area of cross-section will be,


Resistance, R= 10

And, Length, L = (To be calculated)

Now, putting these values in the formula:

Thus, the length of copper wire required to make 10 resistance will be 122.5 meters.

(b) The resistance of a wire is inversely proportional to the square of its diameter. So, when the diameter of the wire is doubled (that is, made 2 times), then its resistance will become (one-fourth).

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