$A$ plane electromagnetic wave of frequency $20 \text{ MHz}$ travels through space along the $x$-direction. If the electric field vector at a certain point in space is $6 \text{ V m}^{-1}$,what is the magnetic field vector at that point?
- A$2 \times 10^{-8} \text{ T}$
- B$\frac{1}{2} \times 10^{-8} \text{ T}$
- C$2 \text{ T}$
- D$\frac{1}{2} \text{ T}$
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