Question

What is the resistance of a 20.0-meter-long

Answer 1

Answer:

Option (2)

Explanation:

The resistance of a conductor is directly proportional to the length of the conductor and inversely proportional to the area of the conductor. The formula for the resistance is given by

$R = \rho \frac{l}{a}$

Where, ρ is the resistivity of tungsten, l be the length of tungsten and a be the area of cross section.

The value of resistivity for tungsten is 5.6 x 10^-8 ohm metre.

$R = 5.6\times 10^{-8} \times \frac{20}{10^{-4}}$

$R = 1.12 \times 10^{-2} Ohm$

Answer 2

I'm pretty sure it's 8, I could be wrong though