Answer
$\phi_i=84.2^{\circ} \text {. }$
Work Step by Step
$\text { } \phi_i=\left.\tan ^{-1}\right|2 \tan 78.5^{\circ} \mathrm{}\\=84.2^{\circ} \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 970: 54d
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