Question

Show that resistance of a conductor depends on the material of the conductor​

Answer 1

Answer:

(a) If we take two similar wires of same length and same diameter , one of copper metal and other of nichrome alloy , we will find that the resistance of nichrome wire is about 60 times more than that of the copper wire. This shows that the resistance depends on the nature of material of the conductor.

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(b) l=10km=10000m

d=2mm

r=1mm=10−3m

ρ=2.7×10−8Ωm

R=ρAl

=2.7×10−8×3.14×(10−3)210000

=0.859×102Ω

≈86Ω

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