Question

A copper wire of length 1X104

cm has a resistance of 5 Ω. Calculate the diameter of the

wire, given that the resistivity of copper is 1.7X10 - 8 Ωm.

Answer 1

Answer:

VERIFIED ANSWER

Explanation:

Given, Diameter=0.5mm,resistivity=1.6×10−8Ω−m,resistance=10Ω

we know that R=ρA1⇒1=ρRA

Where A is the area of the cross-section,

=1.6×10−810×3.14×(20.0005)2=122.7m

Thus the length of the wire is 122.7m