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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.0K
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 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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Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

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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...
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DC Generator01:19

DC Generator

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An alternator converts mechanical energy into electrical energy that varies sinusoidally, resulting in AC current. Meanwhile, a DC generator converts mechanical energy into electrical energy, which are DC pulses with the same polarity. The construction of a DC generator is similar to that of an alternator, except that the pair of slip rings is replaced by a single split ring, also called a commutator. The commutator functions like a periodic rotary switch; it changes the contacts with the...
1.8K
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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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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Electric and Magnetic Field Devices for Stimulation of Biological Tissues
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A multi-channel parameters adjustable magnetic field generator.

Yimei Chen1, Guohui Gao1, Hui Xiong1

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

The Review of Scientific Instruments
|March 2, 2020
PubMed
Summary
This summary is machine-generated.

A new multi-channel parameters adjustable (MCPA) magnetic field generator enhances security and flexibility. This device offers adjustable pulse current, pulse width, and frequency for biological magnetism therapy applications.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience

Background:

  • Traditional magnetic field generators often lack flexibility and security.
  • Optimizing magnetic field parameters is crucial for effective biological therapies.

Purpose of the Study:

  • To design and implement a multi-channel parameters adjustable (MCPA) magnetic field generator.
  • To enhance the security and flexibility of magnetic field generation for therapeutic applications.

Main Methods:

  • Detailed circuit topology and working principles of the MCPA generator were presented.
  • Experimental verification of pulse current characteristics, including amplitude, pulse width, and frequency.
  • Measurement of magnetic field intensity distribution below the scalp with simultaneous channel activation.

Main Results:

  • The MCPA generator demonstrated adjustable pulsed current amplitude (<1000 A), effective pulse width (0-160 µs), and frequency (1-10 Hz).
  • Simultaneous operation of three channels resulted in higher magnetic field intensity in the central area compared to surrounding regions.
  • Flexible channel selection was confirmed as a key feature of the MCPA system.

Conclusions:

  • The developed MCPA magnetic field generator offers significant improvements in security and flexibility.
  • Adjustable parameters and spatial magnetic field distribution highlight its potential for precise biological magnetism therapy.
  • The MCPA system holds substantial application and research value in the field of biological magnetism therapy.