The average electric field of electromagnetic \( \mathrm{P} \) wave...

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The average electric field of electromagnetic
\( \mathrm{P} \)
waves in certain region of free space is \( 9 \times 10^{-4} \)
W
\( \mathrm{NC}^{-1} \). Then the average magnetic field in the same region is of the order of
(1) \( 27 \times 10^{-4} \mathrm{~T} \)
(2) \( 3 \times 10^{-12} \mathrm{~T} \)
(3) \( \left(\frac{1}{2}\right) \times 10^{-12} \mathrm{~T} \)
(4) \( 3 \times 10^{12} \mathrm{~T} \)
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