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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.3K
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 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.
Consider a solenoid with 100 turns wrapped around a cylinder of...
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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.
Magnetic field lines follow several hard-and-fast rules:
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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.
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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 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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Enhancement of the Initial Growth Rate of Agricultural Plants by Using Static Magnetic Fields
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Static magnetic fields reduce epileptiform activity in anesthetized rat and monkey.

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Static magnetic fields (SMF) show potential in reducing abnormal brain activity. This study investigated SMF

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Area of Science:

  • Neuroscience
  • Biophysics
  • Epilepsy Research

Background:

  • Static magnetic fields (SMF) are known to modulate cortical activity.
  • Epileptiform activity is characterized by increased neuronal excitability.

Purpose of the Study:

  • To investigate the effect of SMF on epileptiform cortical activity.
  • To explore the potential therapeutic applications of SMF in epilepsy.

Main Methods:

  • Utilized a Pilocarpine-induced epilepsy rat model.
  • Recorded epileptic-like activity in a Macaca mulatta monkey's visual cortex.
  • Applied a 0.5 T static magnetic field or sham stimulation.

Main Results:

  • In rats, SMF exposure delayed the onset of seizure-like EEG changes compared to sham.
  • In monkeys, SMF significantly reduced the intensity, severity, and duration of abnormal cortical activity.
  • Increased the intensity threshold for visually induced epileptic activity in monkeys.

Conclusions:

  • Static magnetic fields effectively modulate cortical excitability.
  • SMF demonstrates potential as an adjunctive therapy for epilepsy.
  • Further research into SMF for epilepsy treatment is warranted.