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Related Concept Videos

Magnetism01:30

Magnetism

Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
Magnetic Fields01:27

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 Field Lines01:19

Magnetic Field Lines

The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
Energy In A Magnetic Field01:24

Energy In A Magnetic Field

If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
Take an ideal inductor with zero resistance. Although it's practically impossible, assume that the coil's resistance is so small that it is practically negligible. The loss of the field's energy to dissipate thermal energy (or heat) is thus negligible.
The energy...
Magnetic Field due to Moving Charges01:23

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 Flux01:18

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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Updated: Jun 25, 2026

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
11:47

A 100 KW Class Applied-field Magnetoplasmadynamic Thruster

Published on: December 22, 2018

Magnetic fields at neptune.

N F Ness, M H Acuña, L F Burlaga

    Science (New York, N.Y.)
    |December 15, 1989
    PubMed
    Summary
    This summary is machine-generated.

    Voyager 2 detected Neptune

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    Area of Science:

    • Planetary Science
    • Magnetohydrodynamics
    • Astrophysics

    Background:

    • Neptune's intrinsic magnetic field and magnetosphere were previously uncharacterized.
    • Understanding planetary magnetic fields is crucial for studying space weather and planetary evolution.

    Purpose of the Study:

    • To characterize the intrinsic magnetic field and magnetosphere of Neptune.
    • To analyze the interaction of Neptune's magnetosphere with the solar wind.

    Main Methods:

    • In-situ measurements by the Voyager 2 spacecraft's magnetic field experiment.
    • Analysis of magnetic field data to model Neptune's magnetosphere.

    Main Results:

    • Discovery of a strong, complex intrinsic magnetic field and magnetosphere.
    • Detection of a detached bow shock at 34.9 Neptune radii (R(N)) and magnetopause at 26.5 R(N).
    • Magnetic field modeled as an offset tilted dipole (OTD) displaced 0.55 R(N) with a 47-degree inclination.

    Conclusions:

    • Neptune's magnetic field is significantly offset and tilted, similar to Uranus.
    • The magnetosphere's structure influences auroral zones and radiation belts.
    • Further investigation needed for localized magnetic field sources within 4 R(N).