As a theoretically complete fundamental principle of electromagnetism for nearly two centuries, Faraday's law of electromagnetic induction states that the induction voltage in a metal coil is proportional to the number of turns in the coil and the rate of change of magnetic flux through a single turn. Recent research points out that Faraday's law of electromagnetic induction is only an engineering approximation formula，and that Lorentz's magnetic force theorem is the microphysical mechanism of electromagnetic induction. This verification experiment uses two induction coils, CA and CB, of the same structure and size. Coil CA has a single-layer dense winding of 30 turns, and coil CB has a single-layer evenly spaced winding of 15 turns. The induction voltages of coils CA and CB are detected under low and high frequency signals, respectively. The experiment proves that: under low-frequency signals, Faraday's law of electromagnetic induction is an engineering approximation formula. However, under high-frequency (RF) signals, Faraday's law of electromagnetic induction is completely incorrect. Under RF signals, the coil induction voltage depends mainly on the relationship between the wire length and the RF wavelength, as well as the strength of the electromagnetic field radiation attenuation. The coil induction voltage has no direct relationship with the number of turns of the coil.