When a current of 0.218 A is present in a wire 20.0 m in length with cross-sectional area 8.19 x 10 -7 m 2 , the electric field inside the wire is 6.50 x 10 -3 V/m. What are (a) the resistance of the wire and (b) the resistivity of the material of which the wire is made?

When a current of 0.218 A is present in a wire 20.0 m in length with cross-sectional area 8.19 x 10 -7 m 2 , the electric field inside the wire is 6.50 x 10 -3 V/m. What are (a) the resistance of the wire and (b) the resistivity of the material of which the wire is made?

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter21: Current And Direct Current Circuits

Section: Chapter Questions

Problem 61P

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Concept explainers

Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.

Question

When a current of 0.218 A is present in a wire 20.0 m in
length with cross-sectional area 8.19 x 10 -7 m 2 , the electric field
inside the wire is 6.50 x 10 -3 V/m. What are (a) the resistance of
the wire and (b) the resistivity of the material of which the wire
is made?

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