Question

What is the resistivity if a conductor of length 1m diameter 0.15mm resistance 10 to power 4 ohm?

Answer 1

$resistivity = resistance \times \frac{area}{length}$

here, resistance = 10^4 ohm

length = 1m

area = pi * radius * radius

= 3.14 * 0.15/2 * 0.15/2 * 10^-6 m^2

= 1.77 * 10^-8 m^2

so, resistivity = 10^4 * (1.77 * 10^-8)

= 1.77 * 10^-4 ohm*m