Question

Calculate the radius of cross-section of a wire if its length is 27 m, its resistance is 54 Ω and resistivity of wire is 25.12 × 10–2 Ωm?​

Answer 1

R=54Ω

l=27m

$\bold{ρ=25.12 \times {10}^{ - 2}Ωm}$

A=?

$\bold{A=\frac{ρl}{R} }$

$\bold{\therefore \: A =\frac{25.12\times {10}^{ - 2}\times 27}{54} }$

$\bold{A=12.56 \times 10 {}^{ - 2} {m}^{2} }$