Electrical properties of rock smaples from induced magnetic response at audio frequencies.
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Electrical properties of rock smaples from induced magnetic response at audio frequencies.

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Published .
Written in English

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Thesis (M.A.) -- University of Toronto, 1961.

The Physical Object
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Open LibraryOL22585429M

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In terms of transmission, the magnetic field created by the outgoing current is almost exactly canceled by the field from the return current, so electromagnetic waves are only weakly induced. In reception, both conductors are bathed in the same electric and magnetic fields, so an emf that adds current on one side subtracts current from the other side, resulting in cancelation. 0djqhwlf 6xvfhswlelolw\ pdjqhwlf ilhog surgxfhv olqhv ri irufh wkdw shqhwudwh wkh phglxp wr zklfk wkh ilhog lv dssolhg 7kh ghqvlw\ ri wkh olqhv ri irufh lv nqrzq dv wkh pdjqhwlf iox[ ghqvlw\. The interface contrast in electrical or mechanical properties can induce the seismoelectric conversion during the propagation of seismic waves, creating the interface response EM field. The electric component E lies in a vertical plane and the magnetic component H lies at right angles to the direction of propagation in a horizontal plane. A conductor that strikes in the direction of the transmitter is cut by the magnetic vector and the induced currents produce a secondary magnetic field.

ble exception of some special magnetic computer circuits, responding to im- pulses up to kc. Only minor explora- tory tests have been made with magnetic circuits at audio and radio frequencies. These tests showed that gains of over per stage can be obtained at audio frequencies and at radio frequencies up to Size: KB.   This lecture discusses the classification of materials based on their electrical and magnetic properties. Frequency-Dependent Magnetic Permeability In response to changes in an applied magnetic field, the induced magnetization within most rocks may be considered an instantaneous process. For some lateritic soils and rapidly cooled basalts however, a portion of the induced magnetization undergoes a relaxation process. The method of measurement of impedance depends on the frequency being used for the test. 1 At audio-frequencies (from about 50 Hz to kHz), a bridge method is suitable. Resonance methods can be used up to about MHz. The condenser is connected in series with an inductance L in a resonant circuit, with the current measured by a high-impedance voltmeter across the condenser.

For magnetic insulation, we used a mu-metal double foil, 1mm thick for each foil (Mumetal, Meca-Magnetic). According to the manufacturer, magnetic field intensity ( mT, ac, 50 Hz) is diminished by a factor of (≈ 58 dB). For grounding electric insulation Cited by: magnetic field: A condition in the space around a magnet or electric current in which there is a detectable magnetic force, and where two magnetic poles are present. Mass Spectrometry Mass spectrometry (MS) is the art of displaying the spectra (singular spectrum) of the masses of a sample . To trace the magnetic curve, the vibrating sample (frequency of vibration equal to 80 Hz) has been subjected to a magnetic field whose intensity varied in the range ± 1 T which was sufficient to reach magnetic saturation in all the examined samples. The measured magnetic moment has been depurated by the previously measured diamagnetic response.   Electrode polarization is a major problem in the determination of dielectric properties of samples, particularly at low frequencies. Understanding of these interfacial phenomena is essential in order to measure correctly the electrical properties of a sample of interest. This paper presents a comparative study of the effect of electrode contact impedance on A.C. electrical properties of a Cited by: