Question

A piece of resistance wire of diameter 0.2 M and resistance 0.7 ohms has resistivity of 8.8 × 10-⁴ohms M. Calculate the length of the wire​

Answer 1

Answer:

35.7m

Explanation:

Resistivity = (Resistance x Cross-sectional area) / length

Cross-sectional area of a circle - πr^2

Diameter is 0.2m hence radius is 0.1m.

0.00088 = (0.7 x π (0.1)^2) / length

Length = 35.7m