An iron wire has a diameter 1.6 mm and resistivity9.71x 10-8 Qm. What will be the length of this wireto make a resistance of 80Q. What will be the newresistance, if the radius is doubled?(a) Length of the wire (in m) =%3D(b) Resistance of the wire (in )N =

An iron wire has a diameter 1.6 mm and resistivity 9.71x 10-8 Qm. What will be the length of this wire to make a resistance of 80O. What will be the new resistance, if the radius is doubled? (a) Length of the wire (in m) = (b) Resistance of the wire (in )N =

An iron wire has a diameter 1.6 mm and resistivity 9.71x 10-8 Qm. What will be the length of this wire to make a resistance of 80O. What will be the new resistance, if the radius is doubled? (a) Length of the wire (in m) = (b) Resistance of the wire (in )N =

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

An iron wire has a diameter 1.6 mm and resistivity
9.71x 10-8 Qm. What will be the length of this wire
to make a resistance of 80Q. What will be the new
resistance, if the radius is doubled?
(a) Length of the wire (in m) =
%3D
(b) Resistance of the wire (in )N =

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