Ratio Of Electric And Magnetic Field Amplitudes — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Ratio of Electric and Magnetic Field Amplitudes Applicable to plane electromagnetic waves propagating in vacuum or air where the refractive index is approximately unity. Start from Maxwell's equations in vacuum Apply Faraday's Law to a rectangular loop in the plane of the wave Relate the spatial derivative of the electric field to the time derivative of the magnetic field Substitute the sinusoidal wave expressions to extract the ratio Wave must be propagating in a vacuum or non-dispersive medium Fields must be the amplitudes (peak values) or both must be RMS values Thinking that the magnetic field is stronger than the electric field because B is multiplied by c in some units; in SI units, E is numerically much larger than B Assuming this ratio changes with frequency; c is constant for all frequencies of the EM spectrum in vacuum