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alternating current amperes angle anode applied armature atoms axis ballistic battery capacity cathode cell circuit coil condenser conductor connected constant copper coulomb coulometer current flows Daniell cell deflection Describe dielectric dielectric constant direction disc discharge distance earth effect electric charge electric current electrode potential electrolyte electromagnetic electrometer electroscope electrostatic energy equal ergs flux frequency galvanometer gauss heat Hence hydrogen increase induced e.m.f. induction insulated ions iron joules junction known length lines of force magnetic field magnetic meridian magnetic pole magnetic potential magnetometer measured medium metal method N-pole negative charge obtained Ohm's Law ohms parallel particles perpendicular plane plates platinum positive charge potential difference produced quadrants radiation radius rays resistance resultant rotation shown in Fig solenoid solution sphere substance surface temperature theory thermo-electric torsion tube vane velocity voltmeter volts Wheatstone bridge wire X-rays zero zinc