Question

the resistance of a wire length 30 M and diameter 1 mm is 30 ohm.find the resistivity of the material of the wire

explanation please​

Answer 1

Explanation:

2.514×10

−7

Ωm

Given : R=2Ω l=1 m d=0.4 mm =0.0004 m

Cross section area of wire A=

4

πd

2

=

4

π×(0.0004)

2

=1.256×10

−7

m

2

Resistivity of the material ρ=

l

RA

∴ ρ=

1

2×1.256×10

−7

=2.514×10

−7

Ωm

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