A slab of metal of volume V is made into a rod of length L. The rod carries current I when the electric field inside is E. Find the resistivity of the metal ρ. Expess your answer in terms of the given quantities.   The rod is now stretched so that its length is doubled. If the electric field remains the same, what is the new current I′ in the rod? Express your answer in terms of some or all of the quantities given in the problem introduction.   A piece of copper is made into a rod with a square cross-section. The side of the square is 2.00 centimeters. The resistivity of copper is 1.7⋅10−8 Ω⋅m. An unknown electric field E, directed along the rod, creates a current of 12.0 amperes through the rod. Find the magnitude of E. Use two significant figures in your answer. Express your answer in newtons per coulomb.

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
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A slab of metal of volume V is made into a rod of length L. The rod carries current I when the electric field inside is E.

Find the resistivity of the metal ρ.
Expess your answer in terms of the given quantities.
 
The rod is now stretched so that its length is doubled. If the electric field remains the same, what is the new current I′ in the rod?
Express your answer in terms of some or all of the quantities given in the problem introduction.
 
A piece of copper is made into a rod with a square cross-section. The side of the square is 2.00 centimeters. The resistivity of copper is 1.7⋅10−8 Ω⋅m. An unknown electric field E, directed along the rod, creates a current of 12.0 amperes through the rod. Find the magnitude of E.
Use two significant figures in your answer. Express your answer in newtons per coulomb.
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