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Q.

The peak electric field produced by the radiation coming from the 8 W bulb at a distance of 10 m is x 10 μ 0 c π V m  . The efficiency of the bulb is 10% and it is a point source. The value of x is____________. 

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answer is 2.

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Detailed Solution

I=12c∈0E0284π×102×12=14×c×1μ0c2×E02E0=210×μ0cπ⇒x=2   

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