FIELD: educational aids for colleges and universities. SUBSTANCE: device has plates of capacitor, electromotive force recorder, two-pole switch which has two positions, harmonic oscillator, vessel with liquid dielectric which is located between second and third plates of capacitor, first measuring coil, which is located between first and second plates of capacitor, second measuring coil which is located in vessel with liquid dielectric. EFFECT: increased functional capabilities. 4 dwg
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