Answer
$B(r) = \frac{\mu_0~i}{2\pi~r}$
Work Step by Step
We can find an expression for $B(r)$:
$\int~B\cdot ds = \mu_0~i_{enc}$
$B\cdot 2\pi~r = \mu_0~i$
$B(r) = \frac{\mu_0~i}{2\pi~r}$
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 863: 87b
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