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Related Concept Videos

Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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.
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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...
Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

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...
Diamagnetism01:26

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

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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Related Experiment Video

Updated: Jun 27, 2026

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
07:17

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Published on: August 1, 2017

Diamagnetic loop for the first plasma in the KSTAR machine.

J G Bak1, S G Lee, E M Ka

  • 1National Fusion Research Institute, Gwahangno 113, Yuseong-Gu, Daejeon 305-333, Republic of Korea. jgbak@nfri.re.kr

The Review of Scientific Instruments
|December 3, 2008
PubMed
Summary
This summary is machine-generated.

The diamagnetic loop (DL) was installed in the KSTAR tokamak for plasma measurements. This study details DL positioning, vacuum flux evaluation, and hardware compensation for accurate diamagnetic measurements.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Tokamak diagnostics

Background:

  • The Korea Superconducting Tokamak Advanced Research (KSTAR) machine requires precise plasma diagnostics.
  • Diamagnetic measurements are crucial for understanding plasma behavior in tokamaks.

Purpose of the Study:

  • To install and evaluate the diamagnetic loop (DL) for plasma diamagnetic measurements in the KSTAR.
  • To assess the DL's geometrical data and balance coefficient for vacuum flux compensation.

Main Methods:

  • Position measurement of the DL within the KSTAR vacuum vessel.
  • Vacuum flux measurement using the DL.
  • Evaluation of geometrical data and balance coefficient for DL calibration.
  • Preliminary development of a hardware compensation instrument for vacuum flux.

Main Results:

  • Successful installation and initial operation of the DL in KSTAR.
  • Experimental data on DL positioning and vacuum flux characteristics obtained.
  • Evaluation of DL parameters for accurate diamagnetic measurements.
  • Development of a preliminary instrument for hardware-based vacuum flux compensation.

Conclusions:

  • The diamagnetic loop is a viable diagnostic for KSTAR.
  • Accurate geometrical data and balance coefficients are essential for compensating vacuum flux.
  • The developed instrument shows promise for real-time vacuum flux compensation.