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a.c. potentiometer accuracy accurate adjusted alternating alternating current ammeter amperes anode arrangement B.Sc.II balance condition balance equations ballistic galvanometer battery beam bridge circuit bridge methods calculated calibrated cathode-ray tube charge circuit of fig components connected in series constant d.c. supply deflection described detector determined dielectric dimensions direct current e.s. units electrical quantities electron electrostatic equal flux density frequency galvanometer circuit give Hence hysteresis impedance induced e.m.f. insulation large number leakage length loop M.K.S. unit magnetizing force magnetizing winding magnitude measurement meter mutual inductance non-inductive resistance number of turns obtained ohms parallel permittivity phase angle plates position possible potential difference power factor practical units primary standard reactance reading resistor resonance reversed screen search coil self-inductance sensitivity shown in fig shunt slide-wire solenoid specimen suitable switch tance terminals usually valve voltmeter variable voltage voltmeter volts wattmeter Wheatstone bridge wire Y-plates zero