Equation of electric field as function of position
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The figure above represents the electric field `E` as a function of position `x` due to a particular radio wave at time `t=0 s`. which of the following equations correctly describes the electric field? This is a `cos` function with wavelength `λ = 4 m` and amplitude `A = 100 N//C`. `E = Acos((2π)/λ x )` `E = (100 N//C)cos((2π)/(4 m) x )` `E = (100 N//C)cos((πx)/(2 m) )`

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