A Light Source Radiates 60

question 20

Multiple Choice

A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions.What is the amplitude of the magnetic field of this light at a distance of 0.700 m from the bulb? (ε₀ = 8.85 × 10^-12 C²/N ∙ m²,μ₀ = 4π × 10^-7 T ∙ m/A,c = 3.0 × 10⁸ m/s)

• A)1.76 × 10^-7 T
• B)2.02 × 10^-7 T
• C)2.22 × 10^-7 T
• D)2.86 × 10^-7 T

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