For a given electromagnetic wave,the magnitude of the electric field is $6.6 \,V \,m^{-1}$ at a point in space. The magnitude of the magnetic field at this point is . . . . . . $T$.
- A$2.1 \times 10^{-8}$
- B$6.6 \times 10^{-8}$
- C$19.8 \times 10^{-8}$
- D$2.2 \times 10^{-8}$
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