Question

Calculate the resistivity of iron of an iron wire of length 1m and area of cross section 10 mm2 has 10Ω resistance at 0c.

Answer 1

Answer:

L=1m=100cm

A=2×10

−3

cm

2

R=10Ω

⇒R=

A

ρL

⇒ρ=

L

RA

=

100

10×2×10

−3

⇒ρ=2×10

−4

Ωcm