A plane electromagnetic wave propagating in the \( x \)-direction has a wavelength of \( 60 \mat...

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A plane electromagnetic wave propagating in the \( x \)-direction has a wavelength of \( 60 \mathrm{~mm} \). The electric field is in the \( y \)-direction and its maximum magnitude is \( 33 \mathrm{Vm}^{-1} \). The equation for the electric field as function of \( x \) and \( t \) is
(a) \( 11 \sin \pi(t-x / c) \)
(b) \( 33 \sin \pi \times 10^{11}(t-x / c) \)
(c) \( 33 \sin \pi(t-x / c) \)
(d) \( 11 \sin \pi \times 10^{11}(t-x / c) \)
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