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posted by  Hawkeye2012 on 11/7/2009 2:17:30 AM  |  status: Closed  |  Earned Karma: 74

Physics Practice Test Question: 29.5

Course Textbook Chapter Problem Needs by
Calculus Based Physics Fundamentals of Physics Extended (8th) by Halliday, Resnick, Walker N/A N/A 11/8/2009 at 2:00:00 PM
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posted by zsm28 on 11/7/2009 12:15:49 PM  |  status: Live
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current density j = I/[π(b2 - a2)] = constant
for a <= r <= b, using Ampere's law
B = μ0/(2πr) * j * (r2 - a2) = μ0j/2π * (r - a2/r)
dB/dr = μ0j/2π * (1 + a2/r2) = slope m of the curve that is not a constant and has the largest value when r = a
∴answer: C
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