Principles of Electricity and Electromagnetism |
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Page 325
... coil instruments . As it is not practicable to make an absolute determination of m , the instrument is calibrated by passing a known current through the coils and the coefficient of 0 or the ratio Permanent magnet Terminal Fiber Iron ...
... coil instruments . As it is not practicable to make an absolute determination of m , the instrument is calibrated by passing a known current through the coils and the coefficient of 0 or the ratio Permanent magnet Terminal Fiber Iron ...
Page 341
... coil and $ = tan - 1 ( wL / R ) . What is the angle between the normal to the plane of the coil and the field at maximum current ? 14. Neglecting friction show that the average value of the torque necessary to maintain the rotation of ...
... coil and $ = tan - 1 ( wL / R ) . What is the angle between the normal to the plane of the coil and the field at maximum current ? 14. Neglecting friction show that the average value of the torque necessary to maintain the rotation of ...
Page 411
... Coil 2 Bo Coil c Bo Coil b Coil a + X ωο ( b ) Coil I ( ၁ ) FIG . 12.25 . - Rotating magnetic fields . ( a ) Field due to a single - turn coil may be con- sidered as two constant fields rotating in opposite senses . ( b ) Rotating ...
... Coil 2 Bo Coil c Bo Coil b Coil a + X ωο ( b ) Coil I ( ၁ ) FIG . 12.25 . - Rotating magnetic fields . ( a ) Field due to a single - turn coil may be con- sidered as two constant fields rotating in opposite senses . ( b ) Rotating ...
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alternating current alternating-current ampere amplifier amplitude angle angular anode antenna applied approximately armature assumed atom axis calculated capacity cathode cell characteristic charge circuit coefficient coil component condenser conducting conductor considered constant curl current flowing curve deflection density determined dielectric dielectric constant direct-current direction dynamic resistance effective electric field electromagnetic electromotive force electrons electrostatic element energy equal equation flux force frequency function galvanometer grad harmonic hence impedance induction integral ions known length linear load magnetic field magnetic moment magnitude maximum measured meter negative obtained ohms oscillations output parallel phase plane plate current positive potential difference potentiometer quantities R₁ radiation radius ratio reactance region represents resistance resonant rotation scalar shown in Fig solution surface temperature terminals theorem torque transconductance triode tube unit vacuum tube vector velocity voltage volts wave wire written zero