Question

Calculate the radius of cross-section of a wire if its length is 27 m, its resistance is 54 ohm and resistivity of wire is 25.12 x 10^-2 ohm

Answer 1

Answer

R=

A

ρl

⇒A=

R

ρl

⇒A=

46

1.84×10

−6

×2

⇒A=8×10

−8

m

2