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A plane-polarized electromagnetic wave of frequency \( 6 \times 10^{8} \mathrm{~Hz} \) is propagating through a region of space.
\( \mathrm{P} \) Electric field is along positive \( z \)-direction and magnetic

W field is along positive \( y \)-direction at some instant. The peak value of electric field is 3 milli-volt \( / \mathrm{m} \).
The electromagnetic wave could be represented by
(1) \( B=\left(10^{-8}\right) \sin 2 \pi\left[2 x-\left(6 \times 10^{8}\right) t\right] \)
(2) \( B=\left(10^{-11}\right) \sin 2 \pi\left[2 x-\left(6 \times 10^{8}\right) t\right] \)
(3) \( B=\left(10^{-11}\right) \sin 2 \pi\left[2 x+\left(6 \times 10^{8}\right) t\right] \)
(4) \( B=\left(10^{-8}\right) \sin 2 \pi\left[2 x+\left(6 \times 10^{8}\right) t\right] \)
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