$1$

Multiple Choice $12$ points

An electromagnetic plane wave travels through some transparent medium and consists of electric and magnetic fields. The electric field is given by: vec$(E)=3\mathrm{.}75\frac{(V)}{(m)}cos[(1\mathrm{.}37{10}^7\frac{\text{r}\text{a}\text{d}}{m}r)+(3\mathrm{.}56{10}^{15}\frac{\text{r}\text{a}\text{d}}{s}t)]hat(i)$

where $r$ is the distance from the origin along the direction of propagation of the wave.

Determine the amplitude of the magnetic compinent of the wave, B$0.$