Answer
30mm
Work Step by Step
$
\text { Inside the capacitor, } 0.75 B_{\max } / B_{\max }\\=r_1 / R \text {, or } r_1=0.75 R=0.75(40 \mathrm{~mm})\\=30 \mathrm{~mm} \text {. }
$
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 967: 12a
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