Answer
$B=0$
Work Step by Step
$\int~B\cdot ds = \mu_0~i_{enc}$
Since $~~i_{enc} = 0~~$ when $~~r=0,~~$ the magnetic field at $~~r=0~~$ is $~~B = 0$.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 29 - Magnetic Fields Due to Currents - Problems - Page 861: 47a
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