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Related Concept Videos

Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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.
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

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

Magnetic Force On Current-Carrying Wires: Example

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.
Types Of Superconductors01:28

Types Of Superconductors

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

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.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...

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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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A Superconducting Joint Technique for MgB(2) Round Wires.

Weijun Yao1, Juan Bascuñán, Seungyong Hahn

  • 1FBML/MIT, Cambridge, MA 02139 USA.

IEEE Transactions on Applied Superconductivity : a Publication of the IEEE Superconductivity Committee
|July 31, 2010
PubMed
Summary

This study presents a new technique for superconductively splicing multifilament magnesium diboride (MgB2) wires. The developed joints can carry 200 A at 10 K, advancing superconducting wire technology.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Electrical Engineering

Background:

  • Magnesium diboride (MgB2) is a promising superconductor due to its relatively high critical temperature and low cost.
  • Efficient joining techniques are crucial for scaling up MgB2 wires for practical applications.
  • Existing methods for splicing multifilament MgB2 wires often face challenges in achieving high current carrying capacity.

Purpose of the Study:

  • To develop and present a novel technique for superconductively splicing multifilament MgB2 wires.
  • To characterize the performance of the developed joints in terms of critical current.
  • To provide detailed insights into the joint fabrication and testing methodologies.

Main Methods:

  • Superconductive splicing of multifilament MgB2 wires using a proprietary technique.
  • Critical current measurements conducted at 10 K in self-field conditions.
  • Detailed analysis of joint geometry and material properties.

Main Results:

  • Successfully achieved superconductively spliced joints capable of carrying a significant current.
  • Demonstrated a critical current of 200 A at 10 K in self-field for the spliced joints.
  • The technique proved effective in maintaining superconducting properties across the splice.

Conclusions:

  • The developed superconductive splicing technique is effective for multifilament MgB2 wires.
  • The achieved joint performance meets the requirements for certain high-current applications.
  • This advancement facilitates the practical utilization of MgB2 wires in superconducting devices.