In dry weather the electric potential in the atmosphere is normally positive relative to the earth, and increases with the height.
Varley, who proposed to make use of it in a telegraphic receiving instrument.4 In Dolbear's instrument one plate of a condenser was a flexible diaphragm, connected with the telephone line in such a way that the varying electric potential produced by the action of the transmitting telephone caused an increased or diminished charge in the condenser.
A transverse difference of electric potential (Hall effect).
An exactly similar expression holds good in hydrokinetics, provided that for the electric potential we substitute velocity potential, and for the electric force the velocity of the liquid.
POTENTIOMETER, an instrument for the measurement of electromotive force and also of difference of electric potential between two points.
A voltmeter isan instrument for measuring difference of electric potential in terms of the unit called a volt.
Neglecting the external heat-loss, and the variation of the thermal and electric conductivities k and k', we obtain, as before, for the difference of temperature between the centre and ends, the equation O, Tho z Go = C 2 R1/8qk = ECl/8qk = E 2 k'/8k, (11) where E is the difference of electric potential between the ends.
Usually the electric potential near the ground is positive compared to the earth and increases with the height (see Atmospheric Electricity).
ELECTROSCOPE, an instrument for detecting differences of electric potential and hence electrification.
He has constructed a capillary electrometer by which differences of electric potential less than o oi of that of a Daniell's cell can be detected by the difference of the pressure required to force the mercury to a given point of a fine capillary tube.
Topics include: basic electrostatics, electrostatic induction, Coulomb's Law, electric field strength, and electric potential.
- In dry weather the electric potential in the atmosphere is normally positive relative to the earth, and increases with the height.
VOLTMETER, an instrument for measuring difference of electric potential (see Electrostatics) in terms of the unit called a volt.
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