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Related Concept Videos

Energy In A Magnetic Field01:24

Energy In A Magnetic Field

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If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus...
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Magnetic Fields01:27

Magnetic Fields

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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.
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Magnetic Field of a Solenoid01:18

Magnetic Field of a Solenoid

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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
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Magnetic Field Lines01:19

Magnetic Field Lines

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The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
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Magnetic Field Of A Current Loop01:16

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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 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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Multifunctional Hybrid Fe2O3-Au Nanoparticles for Efficient Plasmonic Heating
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A multifunctional energy-saving magnetic field generator.

Hui Xiong1, Wanpeng Sun1, Jinzhen Liu1

  • 1School of Electrical Engineering and Automation, Tianjin Polytechnic University, Tianjin 300387, China.

The Review of Scientific Instruments
|April 2, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces an energy-saving magnetic field generator (ESMFG) for biological applications. The device efficiently produces alternating magnetic fields (AMF) and bipolar pulse magnetic fields (BPMF) with high energy reuse.

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Area of Science:

  • Biomedical Engineering
  • Electrical Engineering
  • Applied Physics

Background:

  • Magnetic field generators are crucial for various biological applications.
  • Improving energy efficiency in these generators is essential for practical use.
  • Existing technologies often have limitations in energy utilization and functionality.

Purpose of the Study:

  • To develop a multifunctional energy-saving magnetic field generator (ESMFG).
  • To enable the production of both alternating magnetic fields (AMF) and bipolar pulse magnetic fields (BPMF).
  • To achieve high energy-saving and energy-reuse rates for enhanced efficiency.

Main Methods:

  • Theoretical analysis of an RLC second-order circuit to calculate energy-saving and energy-reuse rates.
  • Experimental validation using the proposed ESMFG.
  • Characterization of magnetic field intensity and current for both AMF and BPMF outputs.

Main Results:

  • The ESMFG successfully generated AMF (11.0 mT intensity, 20 A RMS current) and BPMF (70.3 mT peak intensity, 130 A peak current).
  • Achieved energy-saving rates of 61.3% and energy-reuse rates of 63.5% for AMF.
  • Demonstrated an energy-saving rate of 33.6% for BPMF.

Conclusions:

  • The proposed ESMFG offers a multifunctional and energy-efficient solution.
  • The generator exhibits high energy-saving and energy-reuse capabilities.
  • The ESMFG shows significant potential for diverse biomedical applications.