In an e.m. wave propagating in vacuum , the electric field oscillates sinusoidally at a frequency of $2.5\times {10}^{10} \mathrm{Hz}$ and amplitude 480 V/m. The amplitude of oscillating magnetic field will be

• A

  $1.52\times {10}^{-8} \mathrm{Wb}/{\mathrm{m}}^2$

• B

  $1.52\times {10}^{-7} \mathrm{Wb}/{\mathrm{m}}^2$

• C

  $1.6\times {10}^{-6} \mathrm{Wb}/{\mathrm{m}}^2$

• D

  $1.6\times {10}^{-7 }\mathrm{Wb}/{\mathrm{m}}^2$