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## Homework Statement

The problem I have been working with recently has been deriving the speed of light using maxwells equations, however in order to do this I must make two assumptions; there is no net charge or displacement currents in the space in which I am attemptin to derive the speed of light. If I make these assumptions I am able to find that the speed of light is equal to 1/√(εμ) or ≅ 3E8 meters per second. I do not understand why I must make these assumptions.

## Homework Equations

Maxwell's Equaitons