In the 19th century, James Clerk Maxwell calculated the speed of light in a vacuum from the proportionality constants used in electrostatics and magnetism. Which of the following relationships correctly identifies how light moves in a vacuum?

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In the 19<sup>th</sup> century, James Clerk Maxwell calculated the speed of light in a vacuum from the proportionality constants used in electrostatics and magnetism. Which of the following relationships correctly identifies how light moves in a vacuum?