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Related Concept Videos

Migration00:53

Migration

9.0K
Migration is long-range, seasonal movement from one region or habitat to another. This common strategy, carried out by many different organisms around the world, is an adaptive response that typically corresponds to changes in an organism’s environment, like resource availability or climate. Migrations can involve huge groups of thousands of animals as well as single individuals traveling alone and can range from thousands of kilometers to just a few hundred meters.
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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 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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Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Magnetic Flux01:18

Magnetic Flux

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The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

2.3K
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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Related Experiment Video

Updated: Mar 8, 2026

MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T
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MRM Microcoil Performance Calibration and Usage Demonstrated on Medicago truncatula Roots at 22 T

Published on: January 16, 2021

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Migrating coil.

Kai Rou Tey1, Avin Aggarwal2, Bhaskar Banerjee3

  • 1Department of Internal Medicine, University of Arizona College of Medicine, Tucson, Arizona, USA.

BMJ Case Reports
|January 29, 2017
PubMed
Summary
This summary is machine-generated.

A rare case of coil migration into the duodenum caused bleeding 4 years after embolization. Surgical intervention was required when endoscopic and medical treatments failed.

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Area of Science:

  • Gastroenterology
  • Interventional Radiology

Background:

  • Therapeutic embolization of the gastroduodenal artery is used for managing gastrointestinal bleeding.
  • Complications such as device migration are rare but can occur.

Observation:

  • A 60-year-old man with a history of peptic ulcer disease presented with melena and epigastric pain.
  • Endoscopy revealed an oozing duodenal ulcer and a migrated metal coil impacted in the duodenal mucosa, 4 years post-embolization.

Findings:

  • The case highlights a rare complication of coil migration into the duodenal mucosa.
  • The exact cause-effect relationship between the coil migration and the duodenal ulcer remains unclear.
  • The patient required surgical intervention due to failed endoscopic hemostasis and medical management.

Implications:

  • This case underscores the importance of long-term monitoring after arterial embolization procedures.
  • It suggests a potential for delayed complications, including device migration and subsequent gastrointestinal bleeding.
  • Further research may be needed to understand the mechanisms and risk factors for delayed coil migration.