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Magnetic Field Due to Two Straight Wires

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 Wire

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.

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...

Magnetic Force On Current-Carrying Wires: Example

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.

Biot-Savart Law

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The Biot-Savart law gives the magnitude and direction of the magnetic field produced by a current. This empirical law was named in honor of two scientists, Jean-Baptiste Biot and Félix Savart, who investigated the interaction between a straight, current-carrying wire and a permanent magnet.
A current-carrying wire creates a magnetic field in its vicinity. Consider an infinitesimal current element dl in a wire. The direction of vector dl is along the direction of the current. The total magnetic...

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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Related Experiment Video

Updated: May 13, 2026

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Total current blockade in an ultracold dipolar quantum wire.

L H Kristinsdóttir¹, O Karlström, J Bjerlin

¹Mathematical Physics and Nanometer Structure Consortium, nmC@LU, Lund University, Box 118, 22100 Lund, Sweden.

Physical Review Letters

|March 12, 2013

Summary

Ultracold quantum gases in a quantum wire can exhibit a current blockade. Attractive interactions completely suppress current flow at low bias, a novel quantum transport phenomenon.

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Area of Science:

Quantum physics
Mesoscopic systems
Cold atom systems

Background:

Cold-atom systems present unique opportunities for developing novel mesoscopic quantum systems.
These systems offer properties distinct from traditional semiconductor nanostructures.

Purpose of the Study:

Investigate the quantum-gas analogue of a quantum wire.
Identify new quantum transport phenomena in such systems.

Main Methods:

Theoretical investigation of quantum transport in a quantum wire analogue.
Utilizing ultracold quantum gases with dipolar interactions.

Main Results:

Discovery of a novel quantum transport scenario.
Demonstration of complete current suppression in the low-bias range due to attractive interactions.
Observation of a total current blockade effect.

Conclusions:

Attractive interactions in ultracold quantum gases can lead to a complete current blockade.
This finding reveals a new mechanism for controlling quantum transport in mesoscopic systems.