Question

The resistivity of copper at room temperature is 1.72*10^-6 ohm - centimeter. what is the resistance of copper wire 35 meter long and 0.025 cm in cross section​

Answer 1

Answer:

2.4*10^-4

Explanation:

resistance = resistivity × length÷ area

using this,

=1.72*10^-6 × 35 ÷ 0.025×10^-4

Answer 2

The resistance (R) is given by the equation:

 $R$ = ρ ×($\frac{L}{A}$)

Where ρ = resistivity

             L = length

             A = cross-sectional area

Given,

 ρ  =1.72×10^-6 ohm - centimeter

 L = 35 m = 3500 cm

 A = 0.025 $cm^{2}$

Therefore, Resistance (R) of copper = (1.72×10^-6)×$\frac{3500}{0.025}$

                                                       R = 0.2408 ohm