Asked by  | 2nd Nov, 2008, 10:33: PM

Expert Answer:

(a)R = ρ l / a , using this formula you can calculate the required length of copper wire.

Here , a =∏( d/2)2 .

(b) In this case resistivity and length remains same , diameter = d/2. Find the resistances, say as R1 and R2  in the two cases and calculate the ratio.


Answered by  | 4th Nov, 2008, 09:43: PM

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