Question

A wire of length 3 m and area of cross-section 1.7 × 10^-6 m² has a resistance 3 × 10^-2 ohm.

a. What is the formula for resistivity of the wire and what is the unit of it.

b. Calculate the resistivity of the wire.

[ 10th - Physics ]​

Answer 1

Answer:

shanaya333

a. Resistivity of the wire is given by

ρ=RA/L

And It unit is Ohm-m

b. In this case

L=3 m

A

=1.7×10^−6 m^2

R=3×10^−2 ohm

So

ρ=1.7×10^8 Ohm-m