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aa contacts alloy amperes atom BB contacts carbide carbon Chapter chromium cobalt coefficient coercive force compensating coils condenser constant cooling corresponding current rings cycle deflection demagnetisation direction discharge eddy current effect energy ergs ergs per c.c. exciting coil ferromagnetic flux density fluxmeter force H frequency galvanometer throw gauss H curve heat hysteresis loop impressed magnetic increase induced e.m.f. induction density intensity of magnetisation length lines per sq magnet steel magnetic circuit magnetic field magnetic flux magnetic induction magnetisation curve magnetising coil magnetising current magnetising force magnetising solenoid magnetometer needle magnitude manganese means measured molecules netising nickel non-magnetic number of turns obtained paramagnetic permalloy permanent magnet permeability pole pure iron remanence resistance reversing switch rope saturation search coil self-demagnetising force shown in Fig solenoid winding specimen straight line switch Sw2 temperature tungsten values of H wattmeter whilst wire yoke zero