A wire with a resistance of 4.7 is drawn out through a die so that its new length is 4 times its original length. Find the resistance of the longer wire, assuming that the resistivity and density of the material are unchanged. Number Units The number of significant digits is set to 2; the tolerance is + / -2%

Question

Physics

Hillary Clayton

2 August, 16:49

A wire with a resistance of 4.7 is drawn out through a die so that its new length is 4 times its original length. Find the resistance of the longer wire, assuming that the resistivity and density of the material are unchanged. Number Units The number of significant digits is set to 2; the tolerance is + / -2%

+4

Answers (1)

Know the Answer?

Buck · Answer 1

The resistance on the longer wire are 4 times the initial resistance because the resistance are directly proportional to the lenght. R = 18.8 Ω

Explanation:

R = ρ * L / S

ρ: resistivity

L: lenght

S: section