Two copper wires A and B have the same length and are connected across the same battery. If Rg = 9RA, determine the following. HINT (a) the ratio of their cross-sectional areas AB AA (b) the ratio of their resistivities P8 - РА (c) the ratio of the currents in each wire =

Two copper wires A and B have the same length and are connected across the same battery. If Rg = 9RA, determine the following. HINT (a) the ratio of their cross-sectional areas AB AA (b) the ratio of their resistivities P8 - РА (c) the ratio of the currents in each wire =

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter9: Current And Resistance

Section: Chapter Questions

Problem 81CP: A 10-gauge copper wire has a cross-sectional area A=5.26mm2 and carries a current of I=5.00A . The...

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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

Two copper wires A and B have the same length and are connected across the same battery. If R, = 9R , determine the following.
HINT
(a) the ratio of their cross-sectional areas
Ав
AA
(b) the ratio of their resistivities
PB
PA
(c) the ratio of the currents in each wire
=
IA

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