Question

A wire of length 3m and area of cross-section 1.7x10-6m3 has resistance 3x10-2ohm (a) what is the formula of the wire and what is the unit of it

Answer 1

Explanation:

(a) As we know R = ρL/A , where ρ is resistivity

So,

ρ = RA/L

And its unit is ohm meter

(b) ρ = (3×10^-2 × 1.7×10^-6)/3

= 1.7×10^-8 ohm m