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Related Concept Videos

Galvanometer01:25

Galvanometer

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Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
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Gauss's Law01:07

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If a closed surface does not have any charge inside where an electric field line can terminate, then the electric field line entering the surface at one point must necessarily exit at some other point of the surface. Therefore, if a closed surface does not have any charges inside the enclosed volume, then the electric flux through the surface is zero. What happens to the electric flux if there are some charges inside the enclosed volume? Gauss's law gives a quantitative answer to this question.
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Gauss's Law in Dielectrics01:17

Gauss's Law in Dielectrics

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Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
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Pressure Gauges01:20

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Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...
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Gauss's Law: Problem-Solving01:10

Gauss's Law: Problem-Solving

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Gauss's law helps determine electric fields even though the law is not directly about electric fields but electric flux. In situations with certain symmetries (spherical, cylindrical, or planar) in the charge distribution, the electric field can be deduced based on the knowledge of the electric flux. In these systems, we can find a Gaussian surface S over which the electric field has a constant magnitude. Furthermore, suppose the electric field is parallel (or antiparallel) to the area vector...
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Voltmeter01:18

Voltmeter

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A voltmeter is an electrical device that measures the potential difference or voltage between two points. It is connected in parallel with the circuit element it is measuring. A parallel connection is used because elements in parallel experience the same potential difference. The voltmeter is represented by the symbol "V ".
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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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Megagauss sensors.

A Husmann1, J B Betts, G S Boebinger

  • 1The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA.

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Summary
This summary is machine-generated.

Silver chalcogenides, like Ag2Se, show a dramatic, near-linear increase in electrical resistance when exposed to magnetic fields. This makes them promising for developing highly sensitive magnetic field sensors.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Physics

Background:

  • Magnetic fields influence electron behavior in solids, offering insights into electronic structure.
  • Silver chalcogenides (Ag2Se, Ag2Te) are non-magnetic but can exhibit field sensitivity with minimal silver doping.

Purpose of the Study:

  • To investigate the magnetic field response of silver selenide (Ag2Se).
  • To explore the potential of doped silver chalcogenides as magnetic field sensors.

Main Methods:

  • Measurements of electrical resistance in Ag2Se under high magnetic fields (up to 600,000 gauss).
  • Low-temperature studies to observe magnetoresistance oscillations and scaling behavior.

Main Results:

  • Ag2Se demonstrated a large (thousands of percent) and nearly linear increase in resistance with magnetic field, showing no saturation.
  • Observed oscillations in magnetoresistance and a universal scaling form at high fields and low temperatures.

Conclusions:

  • The observed magnetoresistance in Ag2Se suggests a quantum origin for its unprecedented behavior.
  • Doped silver chalcogenides are attractive candidates for magnetic-field sensors, particularly for calibrating intense pulsed magnetic fields.