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In a square room with area of 25 m2 , a bulb of light at distance of 2 m from the wall yields a power

In a square room with area of 25 m2 , a bulb of light at distance of 2 m from the wall yields a power density of 200 Wm-2 at point A as illustrated in figure below. If the bulb is an isotropic radiator, compute the power generated by the bulb?

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