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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

5.9K
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
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Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
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Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Related Experiment Video

Updated: Apr 27, 2026

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
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Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

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Baxter-Wu model in a transverse magnetic field.

Sylvain Capponi1, Saeed S Jahromi2, Fabien Alet1

  • 1Laboratoire de Physique Théorique, Université de Toulouse and CNRS, UPS (IRSAMC), F-31062, Toulouse, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 15, 2014
PubMed
Summary

We studied the Baxter-Wu model

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Area of Science:

  • Condensed Matter Physics
  • Statistical Mechanics

Background:

  • The Baxter-Wu model is a key model for studying magnetic properties.
  • Understanding phase transitions in magnetic systems is crucial.

Purpose of the Study:

  • Investigate low-energy properties of the Baxter-Wu model.
  • Analyze quantum and thermal phase transitions under a transverse magnetic field.

Main Methods:

  • Stochastic series expansion quantum Monte Carlo.
  • Series expansions for low- and high-field limits.
  • Quantum finite-lattice method on a triangular lattice.

Main Results:

  • Identified a phase boundary with a second-order critical line.
  • This line belongs to the four-state Potts model universality class.
  • A first-order line meets the second-order line at a tricritical point.

Conclusions:

  • The Baxter-Wu model exhibits complex phase transitions.
  • A tricritical point exists at approximately (h≈2.3J, T≈J).
  • The findings contribute to understanding magnetic phase diagrams.