An electromagnetic wave travels in free space along the \( x \)-direction. At a particular point in space and time, \( \vec{B} = 2 \times 10^{-7} \, \hat{j} \, \text{T} \) is associated with this wave. The value of corresponding electric field \( \vec{E} \) at this point is ______ \( \text{V/m} \).
