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aerial alternating current ammeter amperes amperes flowing atom axis bar magnet battery brass capacitance capacitor carbon carbon microphone cathode cell centimetre centre Chapter chemical circuit compass-needle conductor connected copper coulombs current flowing curve deflection diaphragm dielectric direct current disc discharge distance dynes e.m.f. induced earth effect electric current electrolyte electromagnetic electrons electroscope electrostatic element equal equivalent farads frequency galvanometer gauss grams heat Hence hydrogen increased induced e.m.f. instrument insulated internal resistance iron joules lines of force magnetic field magnetic pole magnetizing force measured meter metres microphone moving-coil number of turns oersted ohms parallel plane plates pointer potential difference potentiometer produced proportional quantity of electricity radiation resistor right angles shown in Fig shunt sketch solenoid sound sulphuric acid supplied surface temperature terminals torque uniform magnetic field unit positive charge vane vertical voltage voltmeter volts wave Wheatstone Bridge wire zinc