A wire whose length is 2m and whose diameter is 1.5mm carries a current of 1.2A. The wire dissipates thermal energy at the rate of 60mW. The resistivity (in 2.m) of the wire is: a) 4.2x10-8 b) 3.7x10-8 c) 1.4x108 d) 2.8x10-8 e) 7.6x10-8 f) 5.1x10-8

A wire whose length is 2m and whose diameter is 1.5mm carries a current of 1.2A. The wire dissipates thermal energy at the rate of 60mW. The resistivity (in 2.m) of the wire is: a) 4.2x10-8 b) 3.7x10-8 c) 1.4x108 d) 2.8x10-8 e) 7.6x10-8 f) 5.1x10-8

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter28: Current And Resistance

Section: Chapter Questions

Problem 67PQ

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Concept explainers

Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.

Question

A wire whose length is 2m and whose diameter is 1.5mm carries a current of 1.2A. The wire
dissipates thermal energy at the rate of 60mW. The resistivity (in 2.m) of the wire is:
a) 4.2x10-8
b) 3.7x10-8
c) 1.4x10-8
d) 2.8x10-8 e) 7.6x10-8
f) 5.1x10-8
O a
O b

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