What is the total resistance (sum) of the two wires?Express your answer to two significant figures and include the appropriate units.rtotal= What is the current through the wire?Express your answer to two significant figures and include the appropriate units.I= A 16.0-m length of wire consists of 7.0 m of copper followed by 9.0m of aluminum, both of diameter 1.4 mm. A voltage difference of 95mV is placed across the composite wire. The resistivity of copper is1.68 x 10-8 N· m and the resistivity of aluminum is2.65 x 10 8 N. m.

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A 16.0-m length of wire consists of 7.0 m of copper followed by 9.0 m of aluminum, both of diameter 1.4 mm. A voltage difference of 95 mV is placed across the composite wire. The resistivity of copper is 1.68 x 10-8 N· m and the resistivity of aluminum is 2.65 x 10 8 N. m.

A 16.0-m length of wire consists of 7.0 m of copper followed by 9.0 m of aluminum, both of diameter 1.4 mm. A voltage difference of 95 mV is placed across the composite wire. The resistivity of copper is 1.68 x 10-8 N· m and the resistivity of aluminum is 2.65 x 10 8 N. m.

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 17P

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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

What is the total resistance (sum) of the two wires?

Express your answer to two significant figures and include the appropriate units.

rtotal=

What is the current through the wire?

Express your answer to two significant figures and include the appropriate units.

A 16.0-m length of wire consists of 7.0 m of copper followed by 9.0
m of aluminum, both of diameter 1.4 mm. A voltage difference of 95
mV is placed across the composite wire. The resistivity of copper is
1.68 x 10-8 N· m and the resistivity of aluminum is
2.65 x 10 8 N. m.

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