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a-particle alternating current ammeter ampere anode applied atomic number atomic weight axis battery c.g.s. units calculated called capacity cathode cell centimetre centre circuit coil condenser conductor connected constant copper coulomb current flows curve Daniell cell deflection direction discharge distance dynes earth effect electrolyte electromagnetic electron-volts electrons electroscope electrostatic element emitted energy equal equation ergs experiment ferromagnetics filament flux galvanometer given gives heat horizontal hydrogen induced e.m.f. insulated internal resistance ionisation iron isotopes joules lines of force magnetic field magnetisation mass measured metal molecules moving N-pole needle negative charge neutrons nucleus oersteds Ohm's Law ohms parallel particles pass plane plate pole positive charge positive ions potential difference potentiometer pressure produced proportional protons radiation radioactive radius rays right angles rotation solution specimen surface tangent galvanometer temperature tion tube velocity vertical voltage voltmeter volts Wheatstone Bridge wire X-rays zero