There is a potential difference of 1.3 V between the ends of a 20 cm long graphite rod that has a cross-sectional area of 1.9 mm2. The resistivity of graphite is 7.5 10-6 Ω-m. (a) Find the resistance of the rod. _______ (b) Find the current. ________ (c) Find the electric field inside the rod.

There is a potential difference of 1.3 V between the ends of a 20 cm long graphite rod that has a cross-sectional area of 1.9 mm2. The resistivity of graphite is 7.5 10-6 Ω-m. (a) Find the resistance of the rod. _ (b) Find the current. __ (c) Find the electric field inside the rod.

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.

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There is a potential difference of 1.3 V between the ends of a 20 cm long graphite rod that has a cross-sectional area of 1.9 mm². The resistivity of graphite is 7.5 10^-6 Ω-m.

(a) Find the resistance of the rod.

_______

(b) Find the current.

________

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