A Light Source Radiates $60.0 \mathrm {~W}$ Of Single-Wavelength Sinusoidal Light Uniformly in All Directions

A light source radiates $60.0 \mathrm {~W}$ of single-wavelength sinusoidal light uniformly in all directions. What is the amplitude of the magnetic field of this light at a distance of $0.700 \mathrm {~m}$ from the bulb? $\left( \varepsilon _ { 0 } \right.$ $\left. = 8.85 \times 10 ^ { - 12 } \mathrm { C } ^ { 2 } / \mathrm { N } \cdot \mathrm { m } ^ { 2 } , \mu _ { 0 } = 4 \pi \times 10 ^ { - 7 } \mathrm {~T} \cdot \mathrm { m } / \mathrm { A } , c = 3.0 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } \right)$

A) $2.86 \times 10 ^ { - 7 } \mathrm {~T}$
B) $1.76 \times 10 ^ { - 7 } \mathrm {~T}$
C) $2.02 \times 10 ^ { - 7 } \mathrm {~T}$
D) $2.22 \times 10 ^ { - 7 } \mathrm {~T}$