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Related Concept Videos

The Hall Effect01:30

The Hall Effect

Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
Charging Conductors By Induction01:15

Charging Conductors By Induction

The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
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The Electrical Double Layer01:30

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Voltammetric Techniques: Linear-Scan (E vs Time)01:12

Voltammetric Techniques: Linear-Scan (E vs Time)

Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
Induction01:16

Induction

An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...
Debye–Huckel–Onsager Conductance Equation01:28

Debye–Huckel–Onsager Conductance Equation

The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect. According to this equation,...

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Related Experiment Video

Updated: Jul 2, 2026

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
10:36

Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

Published on: January 21, 2016

Double induction method for electrodeless determination of Hall mobility.

R D Swenumson1, U Even, J C Thompson

  • 1Physics Department, The University of Texas at Austin, Austin, TX 78712, USA.

The Review of Scientific Instruments
|April 1, 1978
PubMed
Summary

A novel electrodeless technique accurately measures Hall mobility in metals. This method overcomes limitations of traditional electrode-dependent measurements, proving useful for challenging materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electrical Engineering

Background:

  • Traditional Hall mobility measurements often rely on direct electrical contacts (electrodes).
  • Electrode-dependent measurements can introduce errors or be unfeasible for certain materials, such as corrosive or liquid metals.
  • Developing electrode-free techniques is crucial for accurate characterization of electronic transport properties in diverse materials.

Purpose of the Study:

  • To develop and validate an electrodeless technique for determining Hall mobility.
  • To assess the technique's performance across various metallic samples, including solid and liquid states.
  • To highlight the advantages of this method for materials where electrode contact is problematic.

Main Methods:

  • Utilized a double induction, electrodeless method for Hall mobility determination.
  • Performed measurements on seven solid and liquid metallic samples.
  • Employed a current of 1 A and a magnetic field of 100 G to detect Hall signals.

Main Results:

  • Successfully measured Hall mobility in solid and liquid metallic samples.
  • Detected signals as low as 50 picovolts (pV), with 100 nanovolts (nV) for copper, silver, and gold.
  • Determined Hall angles as small as 2 x 10^-6 radians, demonstrating high sensitivity.
  • Results were consistent with reported Hall mobility values for the tested materials.

Conclusions:

  • The electrodeless double induction technique is a viable and sensitive method for Hall mobility measurements.
  • This technique eliminates electrode-related artifacts and is suitable for materials incompatible with traditional electrode methods.
  • The method's applicability extends to corrosive or unstable materials, broadening the scope of Hall effect studies.