## Principles of Electricity and Electromagnetism |

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Page 53

It is to be noted that the deflection involves the square of V and

same direction whether V is positive or negative. Thus the instrument may be

used to measure alternating potentials. The chief advantage of an electrostatic ...

It is to be noted that the deflection involves the square of V and

**hence**is in thesame direction whether V is positive or negative. Thus the instrument may be

used to measure alternating potentials. The chief advantage of an electrostatic ...

Page 217

The high input resistance makes the vacuum tube useful as a voltmeter, for its

grid circuit draws very little current and

measurement. A discussion of a typical voltmeter circuit, such as that of Fig. 7.17

...

The high input resistance makes the vacuum tube useful as a voltmeter, for its

grid circuit draws very little current and

**hence**alters but slightly the circuit undermeasurement. A discussion of a typical voltmeter circuit, such as that of Fig. 7.17

...

Page 600

equation becomes This is the basis of the electrostatic system of units (esu.). The

mechanical units are the centimeter, gram, and second; a unit charge is of such ...

**Hence**, for simplicity the constant in the Coulomb law is chosen as unity and theequation becomes This is the basis of the electrostatic system of units (esu.). The

mechanical units are the centimeter, gram, and second; a unit charge is of such ...

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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 grid hence 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 scalar Show shown in Fig solenoid solution surface temperature terminals theorem torque tube unit vector velocity voltage volts wire written zero