A copper wire has a diameter of 0.5 mm and resistivity of 1.6 × 10 −8 Ω m. What has to be the length of this wire so that its resistance becomes 10 Ω ? How much will the resistance change if the diameter is doubled?tell the length of wire?

Solution:

Here diameter of copper wire=0.5 mm

radius=0.5/2=0.25mm=

Area of cross section of wire==

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