115V is applied across a wire with a radius of 0.400mm. The wire is 10.0m long and has a current density of 1.2x10^8 A/m^2. Find (a) the resistivity of the wire (b) the resistance of the wire (c) the current through the wire (d) the new current through the wire when the current density now varies with radius, J = (1.20x10^8) x r^2 A/m^2, where J is in A/m^2 and r is in meters.

115V is applied across a wire with a radius of 0.400mm. The wire is 10.0m long and has a current density of 1.2x10^8 A/m^2. Find (a) the resistivity of the wire (b) the resistance of the wire (c) the current through the wire (d) the new current through the wire when the current density now varies with radius, J = (1.20x10^8) x r^2 A/m^2, where J is in A/m^2 and r is in meters.

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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