Question

Electrical resistivity of nichrome is 100×10 to the power minus 6 ohm metre. Calculate the resistance of nichrome wire 110 cm long and 0.5mm diameter
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Answer 1

Answer:

Given :   R=0.07Ω        l=100 cm =1 m             d=2 mm =0.002 m

Using      R=ρ(π/4)d2l

∴    0.07=ρ(π/4)(0.002)21                 ⟹  ρ=22×10−6  Ω m

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