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Force On A Current Loop In A Magnetic Field

Force On A Current Loop In A Magnetic Field

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...

Torque On A Current Loop In A Magnetic Field

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

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.

Magnetic Force Between Two Parallel Currents

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...

Magnetic Field Of A Current Loop

Magnetic Field Of A Current Loop

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.

Diamagnetism

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.

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Related Experiment Video

Updated: Jul 8, 2026

Magnetic Tweezers for the Measurement of Twist and Torque

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

Spin-torque diode effect in magnetic tunnel junctions.

A A Tulapurkar¹, Y Suzuki, A Fukushima

¹Nanoelectronics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan.

|November 18, 2005

Summary

This summary is machine-generated.

Researchers discovered a new spintronic phenomenon in magnetic tunnel junctions. Applying radio-frequency current generates direct-current voltage at specific frequencies, enabling potential nanodetectors for telecommunications.

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Magnetic Tweezers for the Measurement of Twist and Torque

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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Area of Science:

Spintronics
Condensed Matter Physics
Nanotechnology

Background:

Spintronic devices leverage electron spin for novel functionalities beyond conventional electronics.
Spin-polarized currents exert torque on magnetic moments, causing rotation.

Purpose of the Study:

To investigate a novel phenomenon arising from spin dynamics and spin-dependent transport.
To explore the potential of magnetic tunnel junctions as radio-frequency detectors.

Main Methods:

Application of radio-frequency alternating current to a nanometre-scale magnetic tunnel junction.
Observation of direct-current voltage generation at resonant frequencies.
Tuning resonance with an external magnetic field.

Main Results:

A measurable direct-current voltage is generated when radio-frequency current frequency matches spin oscillation resonance.
The magnetic tunnel junction exhibits distinct resistance states based on current direction at resonance.
This behavior differs significantly from conventional semiconductor diodes.

Conclusions:

The observed phenomenon, based on spin-torque effects and diode behavior, offers new spintronic functionalities.
This discovery could lead to the development of nanometre-scale radio-frequency detectors for telecommunication circuits.