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

Answer 1

Answer:

a) pl/a where p=resistivity l=length, a is cross sectional area

b)

Answer 2

Answer:

a. R= ρ $\frac{L}{A}$
b. 1.7 x $10^{-8}$

Explanation:

substitute the values given in the question to the formula