A nichrome wire of radius and length has a resistivity of .

PHYSICS · Multi-part · A Level · Physics · Electricity · Electricity

Problem

A nichrome wire of radius 0.60 mm0.60\,\text{mm} and length 4.0 m4.0\,\text{m} has a resistivity of 1.1×10−6 Ω m1.1\times10^{-6}\,\Omega\,\text{m}. (i) Calculate the resistance of the wire. (ii) A second nichrome wire of the same length must have exactly twice this resistance. Find the radius that the second wire should have.

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