Question

a copper wire of length 10cm has a diameter of of 1mm find the resistance offered by its resistivity 2×10‐⁷ ohm/m​

Answer 1

Answer:

Given, Diameter=0.5mm,resistivity=1.6×10

−8

Ω−m,resistance=10Ω

we know that R=ρ

A

1

⇒1=

ρ

RA

Where A is the area of the cross-section,

=

1.6×10

−8

10×3.14×(

2

0.0005

)

2

=122.7m

Thus the length of the wire is 122.7m