Question

12. Calculate the resistance of 2 m long copper wire of radius 2 mm. (Resistivity of
copper = 1.72 x 10-822m).

Answer 1

Answer:

Explanation:

Length of copper wire=2 km = 2000 m

Radius of copper wire=2 mm = 2×

Resistivity of copper=1.72x10⁻⁸

Resistance=(Resistivity of copper × Length)/(Area)

                 

Resistance=(Resistivity of copper × Length)/(πr²)

Resistance=[1.72×10⁻⁸*2000]/[22/7×(2×10⁻³)²]

Resistance=(0.0000344)/(22/7)(0.000004)

Resistance=0.0000344/0.00001256

Resistance=2.73 ohm