Speed of electromagnetic waves is related to Electric field and Magnetic field by:

$\overline{){\mathbf{c}}{\mathbf{=}}\frac{{\mathbf{E}}_{\mathbf{m}\mathbf{a}\mathbf{x}}}{{\mathbf{B}}_{\mathbf{m}\mathbf{a}\mathbf{x}}}}$

B_{max} = 1.25 μT(10^{-6}T/1μT) = 1.25 × 10^{-6} T

A sinusoidal electromagnetic wave having a magnetic field of amplitude 1.25 μT and a wavelength of 432 nm is traveling in the +-direction through empty space.

What is the amplitude of the associated electric field?

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