1.

A copper wire has a diameter of 0.5mm and resistivity of 1.6 into 10 to the power minus 8 ohm meter?a. what will be the length of this wire to make resistance 10ohm?b.How much does the resistance change if diameter is double?

Answer»

10 = 1.6 * 10^-8 * l/(π*25*10^-8)l=250π/1.6=2500π/16=625π/4 m

b. R is proportional to 1/d^2thus Resistance is one fourth



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