A 60-W Lightbulb Emits Spherical Electromagnetic Waves Uniformly in All

question 15

Multiple Choice

A 60-W lightbulb emits spherical electromagnetic waves uniformly in all directions. If 50% of the power input to such a lightbulb is emitted as electromagnetic radiation, what is the maximum value of the magnetic field at a distance of 2.0 m from the lightbulb?

• A) 71 nT
• B) 0.35 μT
• C) 0.14 μT
• D) 0.20 μT
• E) 0.10 μT

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