An electric bulb is rated as 200 W. What will be the peak magnetic field at a 4 m distance produced by the radiations coming from this bulb? Consider this bulb as a point source with 3.5% efficiency.
a) ( 1.42 × 10⁻⁶ ) T
b) ( 2.84 × 10⁻⁶ ) T
c) ( 4.26 × 10⁻⁶ ) T
d) ( 5.68 × 10⁻⁶ ) T
