Question

A nichrome wire of 625 millimetre length offers of 4 ohm resistance of the resistivity of metal is 4.8 into 10 raise to power minus 7 metre then calculate area of cross section of wire and draw the v-i graph for it

Answer 1

Answer:

8.75 ×  10⁻⁸ m

Explanation:

Given :

Resistivity ρ = 4.8 × 10⁻⁷ Ω m

Resistance R = 4 Ω

Length L = 625 mm = 625 × 10⁻³ m

We are asked to find cross section area A :

We know :

R = ρ ( L ) / ( A )

= > A = ρ ( L ) / ( R )

Putting values here we get :

= > A = ( 4.8 × 10⁻⁷ × 625 × 10⁻³  ) / 4 m²

= > A = ( 1.4 × 10⁻¹⁰ × 625 ) m²

= > A = 8.75 ×  10⁻⁸ m

Hence we get required answer!