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Related Concept Videos

Magnetic Force01:18

Magnetic Force

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In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
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Magnetic Force Between Two Parallel Currents01:13

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Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
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Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

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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.
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Magnetic Force On Current-Carrying Wires: Example01:22

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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Force On A Current Loop In A Magnetic Field01:17

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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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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Optimal Retention Force of Audio Processor Magnets.

Luise Wagner1, Elisabeth Hönig, Laura Fröhlich

  • 1Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Halle (Saale), Martin-Luther-University Halle-Wittenberg, Germany.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|May 15, 2019
PubMed
Summary

Optimal magnetic retention forces for active hearing implants range from 0.23 to 0.4 N. This range balances device security with patient comfort, preventing loss and skin irritation. Measuring retention force is recommended for all patients.

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Area of Science:

  • Audiology
  • Biomedical Engineering
  • Materials Science

Background:

  • Magnetic retention force in transcutaneous active hearing implants varies significantly between patients.
  • Current methods rely on audiologist experience, leading to suboptimal magnet selection.
  • Inadequate force causes device displacement, while excessive force results in pain and skin issues.

Purpose of the Study:

  • To determine an optimal range for magnetic retention forces in active hearing implants.
  • To establish objective criteria for magnet selection based on in-situ measurements.
  • To improve patient outcomes by minimizing device complications.

Main Methods:

  • Experimentally measured magnetic retention force as a function of distance for various magnet combinations.
  • Assessed in-situ retention forces in 100 hearing device patients.
  • Evaluated patient skin status and comfort through physician assessment and questionnaires.

Main Results:

  • Optimal magnetic retention force was identified as 0.23 to 0.4 N.
  • Magnet strength variations only impacted retention at distances under 6 µm.
  • Patient assessments confirmed this force range as ideal for comfort and fixation.

Conclusions:

  • Current magnet technology limits feasible skin flap thickness to 6 µm.
  • A retention force of 0.23–0.4 N offers the best balance between fixation security and skin health.
  • Routine measurement of magnetic retention force in all patients is advised.