The oscillating magnetic field in a plane \( \mathrm{P} \) electrom...

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The oscillating magnetic field in a plane
\( \mathrm{P} \)
electromagnetic wave is given by \( B_{y}=8 \times 10^{6} \)
W
\( \sin \left(2 \times 10^{-6} t+300 \pi\right. \) at \( ) \). Calculate the phase constant of the wave:
(1) \( 300 \pi \)
(2) \( 200 \pi \)
(3) \( 100 \pi \)
(4) \( 50 \pi \)
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