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220 114. A 100 W electric bulb produces electromagnetic radiation with electric field 2V amplitude of at a distance of 10 m. Assuming it as

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220 114. A 100 W electric bulb produces electromagnetic radiation with electric field 2V amplitude of at a distance of 10 m. Assuming it as a point source, estimate the efficiency of the bulb. (a) 4.9% (b) 2.5% (c) 6.6% (d) 19.7%

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