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Related Concept Videos

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.
A magnetic field is defined by the force that a charged particle experiences...
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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 Force On A Current-Carrying Conductor01:25

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Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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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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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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Magnetically Induced Rotating Rayleigh-Taylor Instability
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Field-induced circulation flow in magnetic fluids.

Anton Musickhin1, Andrey Yu Zubarev1,2, Maxim Raboisson-Michel3,4

  • 1Department of Theoretical and Mathematical Physics, Institute of Natural Sciences and Mathematics, Ural Federal University, Lenin Avenue, 51, Ekaterinburg 620083, Russia.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|April 14, 2020
PubMed
Summary
This summary is machine-generated.

Alternating magnetic fields can create micro-scale flow in ferrofluids. This ferrofluid dynamics could enhance drug delivery in blood vessels.

Keywords:
field-induced flowmagnetic fluidoscillating magnetic field

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Area of Science:

  • Soft Matter Physics
  • Biophysics
  • Fluid Dynamics

Background:

  • Ferrofluids exhibit unique behaviors under magnetic fields.
  • Understanding fluid dynamics is crucial for biomedical applications.

Purpose of the Study:

  • To theoretically investigate circulation flow in ferrofluids.
  • To explore the potential of magnetic fields for inducing flow.
  • To assess the feasibility for enhancing blood vessel drug delivery.

Main Methods:

  • Theoretical modeling of ferrofluid behavior.
  • Analysis of fluid dynamics under alternating inhomogeneous magnetic fields.

Main Results:

  • An alternating magnetic field (17 kA/m amplitude, 10 s⁻¹ frequency) can induce mesoscopic flow.
  • Achieved flow velocity amplitude of approximately 0.5 mm/s.

Conclusions:

  • Ferrofluid circulation can be controlled by specific magnetic field parameters.
  • This controlled flow presents a novel mechanism for targeted drug delivery in vasculature.