## Principles of Electricity and Electromagnetism |

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Page 134

box, of course, draws a current from the external circuit and hence is not adapted

to the

and a standard resistance. The circuit is shown at the right in Fig. 4.23.

box, of course, draws a current from the external circuit and hence is not adapted

to the

**measurement**of emfs. An ammeter can be calibrated with a potentiometerand a standard resistance. The circuit is shown at the right in Fig. 4.23.

Page 191

This quantity n would be difficult to

from the surface is equal to n times e, the electronic charge times the average

velocity of an electron in the vapor. Since the average kinetic energy is

proportional ...

This quantity n would be difficult to

**measure**, but the current which can be drawnfrom the surface is equal to n times e, the electronic charge times the average

velocity of an electron in the vapor. Since the average kinetic energy is

proportional ...

Page 345

can be

magnetic field that induces the same moment as the rotation to, ; - -: From a

knowledge of H and to the ratio of the magnetic to mechanical moment of the

entities ...

can be

**measured**and likewise the moment induced by the rotation (o. If H is themagnetic field that induces the same moment as the rotation to, ; - -: From a

knowledge of H and to the ratio of the magnetic to mechanical moment of the

entities ...

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alternating current alternating-current amplitude angle angular velocity anode antenna applied approximately armature assumed atom axis calculated capacity cathode centimeter characteristic circuit coefficient coil component condenser conducting conductor considered curl current flowing curve deflection density determined dielectric constant direct-current direction discharge displacement distance effective electric field electromotive force electrons electrostatic element energy equal equation ferromagnetic flux force frequency function galvanometer given grad grid hence hysteresis impedance induction integral ions known Laplace's equation linear load magnetic field magnetic moment magnitude maximum measured meter motor negative normal obtained ohms oscillations output parallel phase plane plate polarization positive potential difference potentiometer produced proportional quantity radiation radius ratio reactance region represents resistance resonant rotation Show shown in Fig solenoid solution substance surface temperature terminals theorem torque transformer tube unit vector voltage volts wave wire written zero