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Magnetic Damping

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

Magnetic Force

Magnetic Force

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...

Potential Due to a Magnetized Object

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...

Magnetic Field due to Moving Charges

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...

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.

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.

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Related Experiment Video

Updated: May 8, 2025

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

Magnetic-Induced Force Noise in LISA Pathfinder Free-Falling Test Masses.

M Armano¹, H Audley², J Baird³

¹European Space Technology Centre, European Space Agency, Keplerlaan 1, 2200 AG Noordwijk, The Netherlands.

Physical Review Letters

|March 7, 2025

Summary

This summary is machine-generated.

LISA Pathfinder quantified magnetic noise, crucial for space-based gravitational wave detection. This noise impacts test mass sensitivity, with measured values providing key performance data for future observatories.

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Microfabricated Post-Array-Detectors mPADs: an Approach to Isolate Mechanical Forces

Published on: October 1, 2007

Area of Science:

Astrophysics
Gravitational Wave Astronomy
Space Science

Background:

Space-based gravitational wave observatories require extreme sensitivity.
Magnetic forces are a critical noise source affecting instrument performance at low frequencies.

Purpose of the Study:

To provide the first complete estimate of magnetically induced acceleration noise.
To assess the impact of magnetic forces on LISA Pathfinder's test masses.
To inform the design and performance models of future space-borne gravitational wave detectors.

Main Methods:

Analysis of data from the LISA Pathfinder mission.
Modeling of magnetically induced forces acting on test masses.
Estimation of acceleration noise spectral density.

Main Results:

Magnetic-induced acceleration noise was quantified at low frequencies.
Measurements at 1 mHz were 0.25 fm s⁻²/sqrt[Hz] and at 0.1 mHz were 1.01 fm s⁻²/sqrt[Hz].
The influence of interplanetary magnetic field nonstationarities during space weather events was considered.

Conclusions:

The study provides essential performance data for gravitational wave space missions.
Understanding and mitigating magnetic noise is vital for achieving the sensitivity needed for gravitational wave detection.
Further investigation into space weather effects on magnetic noise is warranted.