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The electromagnetic wave of the radiation field from a wire antenna travels toward the plane of the paper (which is in the \( -z \) direction). At time \( t=0 \mathrm{~s} \), the wave strikes the paper at normal incidence. The magnetic field vector at point \( O \) in the figure points in the \( -y \) direction and has a magnitude of \( 4.0 \times 10^{-8} \mathrm{~T} \). The frequency of the wave is \( 1.0 \times 10^{16} \mathrm{~Hz} \).
What is the magnitude of the associated electric field \( E \) at time \( t=0 \mathrm{~s} \) ?
(A) \( 7.5 \times 10^{-16} \mathrm{~N} / \mathrm{C} \)
(B) \( 7.5 \times 10^{15} \mathrm{~N} / \mathrm{C} \)
(C) \( 1.3 \mathrm{~N} / \mathrm{C} \)
(D) \( 12 \mathrm{~N} / \mathrm{C} \)
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