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alpha particles alternating current ammeter ampere antenna arrangement bar magnet beta particle called changes chapter chemical action circuit coil color compass condenser conductor copper coulomb described device direct current distance dry cells effect elec electric charge electric current electric power electrolyte electromagnetic electromotive force electrons emitted energy Experimental Problems experiments filament flow focal length galvanometer glass grid hydrogen illumination induced current inductance ionized ions iron lamp lead storage battery lens magnetic field measured metal meter mirror motion motor move neutrons nucleus number of turns object Ohm's law ohms ordinary parallel permanent magnet photoelectric placed plate pole positively charged potential difference primary principal focus produce protons radiation radio radioactive radium reactance reflected resistance reversed secondary shown in Figure shows simple substances supplied surface switch telegraph sounder transformer transmitter transmutation ultra-violet visible light voltage voltmeter volts watts wave lengths wire wireless x-rays