Elementary Lessons in Electricity & Magnetism

acid action alternate currents amperes anode armature attracted ball battery capacity carbon cell charge of electricity chemical circuit coil condenser conductor copper current flows deflexion diamagnetic dielectric difference of potential direction discharge disk distance dynes earth earth's magnetism electric force electrified electrified body electromagnet electrometer electromotive-force electroscope electrostatic energy equal Faraday galvanometer glass gramme heat Hence hydrogen induction influence machine instrument insulated inversely iron core kathode knob length Lesson Leyden jar light lines of force liquid machine magnetic field magnetic force magnetic lines magnetic pole magnetic potential measured metal method move N-seeking ohms oscillations pass piece placed plate platinum polarization positive produced proportional quantity of electricity repelled rotating round rubbed shown in Fig spark sphere square centimetre steel strength substances sulphate surface tangent tion torsion balance tube turns unit of electricity velocity volts wire zinc