## Principles of Electricity and Electromagnetism |

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Page 387

The magnetic flux in which the

flowing through the field coils which are wound on the pole pieces marked N and

5 in the figures. If there are m turns in the field, the magnetomotive force is mif

and the ...

The magnetic flux in which the

**armature**rotates is produced by a current ijflowing through the field coils which are wound on the pole pieces marked N and

5 in the figures. If there are m turns in the field, the magnetomotive force is mif

and the ...

Page 396

changes the

equations to yield approximately the same speed control with a smaller change

in torque. For starting a motor of this type a series resistance should be included

in ...

changes the

**armature**and field currents in opposite senses, is seen from theequations to yield approximately the same speed control with a smaller change

in torque. For starting a motor of this type a series resistance should be included

in ...

Page 418

impedance of the secondary circuit is vanishingly small, that of the primary (which

is the

accomplished. The commutator type of alternating-current motor generally has a

series ...

impedance of the secondary circuit is vanishingly small, that of the primary (which

is the

**armature**) is also small by Eq. (12.13) and the desired result isaccomplished. The commutator type of alternating-current motor generally has a

series ...

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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 discharge effective electric field electromagnetic electromotive force electrons electrostatic element energy equal equation flux force frequency function galvanometer given grad grid hence hysteresis impedance induction integral ions known Laplace's equation length linear load magnetic field magnetic induction magnitude maximum measured metal meter negative normal obtained ohms oscillations output parallel phase plane plate polarization positive potential difference potential wave potentiometer produced proportional quantities radiation radius ratio reactance region represents resistance resonant rotation Show shown in Fig solenoid solution surface temperature terminals theorem torque tube unit vector velocity voltage volts wire written zero