Question

calculate the area of. cross section of a wire of length 2 m and its resistance is 25 ohm and resisitivity of wire is 1.84*​

Answer 1

Correct Question:-

Calculate the area of cross section of a wire of length 2 m, resistance 25 Ω and resistivity 1.84×10^−6 Ωm.

Solution:-

$\large\rm { R = \frac {ρl}{A} }$

$\large\rm { ⇒ A = \frac {ρl}{R} }$

$\large\rm { ⇒ A = \frac {1.84 × 10^{-6} × 2}{25} }$

$\large\rm { ⇒ A = 14.72 × 10^{-8} }$