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absolute units ammeter amperes angle anode axis bar magnet battery c.g.s. units Calculate carrying a current cathode cell centre charged coil compass needle conductor connected connexion constant copper coulomb current flows decreases deflection diameter direction distance dynes earth's field electric circuit electric current electrical energy electrolyte electromagnetic electrons equal equation ergs Example field strength flux density galvanometer heat Hence hydrogen increase inductance instrument insulation internal resistance ions joules junction length lines of force lines per sq magnetic circuit magnetic field magnetic force magnetic meridian magnetometer material measured metal molecular magnets motion moving north pole Ohm's law ohms opposite parallel passing perpendicular plate polarity pole strength portion position potential produced proportional repulsive force resistance E.M.F. shown in fig solenoid south pole steel tangent galvanometer temperature torque total flux unit of current unit pole voltmeter volts Wheatstone bridge wire zinc