Physics Thermometry, Thermal Expansion and Calorimetry JEE Main 2022 - ( Thermal Properties of Matter ) MCQ (Single Correct)

An electric bulb is rated as 200 W. What will be the peak magnetic field at 4 m distance produced by the radiations coming from this bulb? Consider this bulb as a point source with 3.5% efficiency.

A
1.19 x 10 -8 T
B
1.71 x 10 -8 T
C
0.84 x 10 -8 T
D
3.36 x 10 -8 T

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The correct answer is:
B

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