a) the current density is • A. doubled • B. halved • C. unchanged b) the conduction-electron density is • A. doubled • B. halved • C. unchanged c) the mean time between collisions is • A. doubled • B. halved • C. unchanged

a) the current density is • A. doubled • B. halved • C. unchanged b) the conduction-electron density is • A. doubled • B. halved • C. unchanged c) the mean time between collisions is • A. doubled • B. halved • C. unchanged

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter7: Electricity

Section: Chapter Questions

Problem 1MA: What does the term fibrillation mean in connection with heart function? Give two important causes of...

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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

If the current in a wire is doubled,

a) the current density is
• A. doubled
• B. halved
• C. unchanged
b) the conduction-electron density is
• A. doubled
• B. halved
• C. unchanged
c) the mean time between collisions is
• A. doubled
• B. halved
• C. unchanged
d) the electron drift speed is
• A. doubled
• B. halved
• C. unchanged

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