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Q.

A radiation is emitted by 100 watt bulb and it generates an electric field and magnetic field. 2.4% of the power is converted into radiation. Calculate the peak value of electric field (V/m) at a distance 2m from the bulb? (Take 14πε0=9×109Nm2/C2 and speed of light = 3×108m/s )

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answer is 6.

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Detailed Solution

Intensity,PowerArea=12ε0E02c2.4100×1004π(2)2=12ε0E02cE=6V/m

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