Do different objects on the receiver coil affect receiver light brightness?

Any metalic object on the receiver coil will alter the inductance(and inductive reactance)of the coil. This affects the balance between the two coils and create self-resonance of the receiver coil which will make the LED go brighter. However, the receiver coil voltage(potential) increase does not necessarily mean a stronger scalar field, as the effects are localized to the coil.

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