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Magnetic Fields

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...

Magnetic Declination

Magnetic Declination

Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...

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.

Magnetic Vector Potential

Magnetic Vector Potential

In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...

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 Flux

Magnetic Flux

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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Related Experiment Video

Updated: Nov 27, 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

A Quantum Ruler for Magnetic Deflectometry.

Lukas Mairhofer¹, Sandra Eibenberger², Armin Shayeghi¹

¹Faculty of Physics, University of Vienna, Boltzmanngasse 5, A-1090 Wien, Austria.

Entropy (Basel, Switzerland)

|December 3, 2020

Summary

This summary is machine-generated.

We demonstrate quantum interference for pre-vitamin 7-dehydrocholesterol, enabling sensitive force detection. This opens new avenues for studying photochemical processes in quantum-delocalized molecules.

Keywords:

magnetic deflectometry matter-waves metrology molecule interference photochemistry

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Area of Science:

Quantum physics
Molecular science
Spectroscopy

Background:

Matter-wave interference offers high sensitivity to external forces by imprinting nano-scale fringe patterns on molecular beams.
Observing shifts in these patterns allows for the detection of minute forces.

Purpose of the Study:

To demonstrate quantum interference of pre-vitamin 7-dehydrocholesterol.
To explore the potential of magnetic deflectometry within a near-field interferometer for investigating photochemical processes.
To address challenges in studying quantum delocalized molecules.

Main Methods:

Utilizing matter-wave near-field interference.
Performing quantum interference experiments on pre-vitamin 7-dehydrocholesterol.
Investigating magnetic deflectometry in a near-field interferometer setup.

Main Results:

Successful demonstration of quantum interference for pre-vitamin 7-dehydrocholesterol.
Identification of conceptual challenges associated with magnetic deflectometry for quantum-delocalized molecules.

Conclusions:

Quantum interference is a viable technique for sensitive measurements on molecular beams.
Near-field interferometry combined with magnetic deflectometry presents a promising, yet challenging, approach to study quantum phenomena in photochemistry.