Question

Calculate the ares of cross - section of a wire of lenght 1 m , Resistance 23ohm and resistivity 1.84×10-6ohm m​

Answer 1

Answer

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Answer 2

Answer:

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