An electromagnetic wave with $$\overrightarrow {\bf{E}} \left( {z,\,t} \right) = {E_0}\cos \left( {\omega t - kz} \right){\bf{\hat i}}$$ is travelling in free space and crosses a disc of radius 2 m placed perpendicular to the Z-axis. If E0 = 60 V/m, the average power in watt, crossing the disc along the Z-direction is
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