Answer
$B_i=0.089 \mathrm{mT} .
$
Work Step by Step
Formula indicates that $i=4.0$ A when $t=20 \mathrm{~ms}$. Thus,
$$
B_i=\mu_0 i / 2 \pi r=0.089 \mathrm{mT} .
$$
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 32 - Maxwell's Equations; Magnetism of Matter - Problems - Page 968: 28a
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