An electromagnetic wave is radiated by a...

An electromagnetic wave is radiated by a 100 W bulb. If efficiency of the bulb is 20% then the amplitude of magnetic field at a distance of 1 m is (consider bulb as a point source)

`sqrt(4/3) * 10^(-7)`T

`sqrt(1/3) * 10^(-7)`T

`2 * 10^(-7)`T

`5 * 10^(-7)`T

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