Mediaspace scheduled maintenance: Aug 25, 2026 07:00 - 12:00 AM. During this time, videos will be temporarily unavailable. Check status updates.

Lecture

Force between Long Straight Wires with Currents: Magnetostatics

In course

PHYS-201(d): General physics: electromagnetism

The topics covered by the course are concepts of electromagnetism, properties of waves, and fluid mechanics. ...

Description

This lecture covers the evaluation and application of magnetic fields as vector fields and field lines, the Lorentz force, cyclotron motion of charge carriers, Ampère-Laplace law, force between conductors, Ampère's and Gauss's laws for flux of magnetic fields, and magnetic dipoles. It also discusses the force between two straight conductors, including the force on conductor 2 by the field of conductor 1, assuming wires in the x, z plane, parallel, and infinitely long. The lecture concludes with a question on calculating the force between two very thin parallel Cu wires.

This video is available exclusively on Mediaspace for a restricted audience. Please log in to MediaSpace to access it if you have the necessary permissions.

Watch on Mediaspace

Instructor

Dirk Grundler

Official source

Related concepts (32)

Magnetic field

A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field. A permanent magnet's magnetic field pulls on ferromagnetic materials such as iron, and attracts or repels other magnets.

Electromagnetic field

An electromagnetic field (also EM field or EMF) is a classical (i.e. non-quantum) field produced by moving electric charges. It is the field described by classical electrodynamics (a classical field theory) and is the classical counterpart to the quantized electromagnetic field tensor in quantum electrodynamics (a quantum field theory). The electromagnetic field propagates at the speed of light (in fact, this field can be identified as light) and interacts with charges and currents.

Magnetic dipole

In electromagnetism, a magnetic dipole is the limit of either a closed loop of electric current or a pair of poles as the size of the source is reduced to zero while keeping the magnetic moment constant. It is a magnetic analogue of the electric dipole, but the analogy is not perfect. In particular, a true magnetic monopole, the magnetic analogue of an electric charge, has never been observed in nature. However, magnetic monopole quasiparticles have been observed as emergent properties of certain condensed matter systems.

Magnetic moment

In electromagnetism, the magnetic moment is the magnetic strength and orientation of a magnet or other object that produces a magnetic field. Examples of objects that have magnetic moments include loops of electric current (such as electromagnets), permanent magnets, elementary particles (such as electrons), composite particles (such as protons and neutrons), various molecules, and many astronomical objects (such as many planets, some moons, stars, etc).

Lorentz force

In physics (specifically in electromagnetism), the Lorentz force (or electromagnetic force) is the combination of electric and magnetic force on a point charge due to electromagnetic fields. A particle of charge q moving with a velocity v in an electric field E and a magnetic field B experiences a force (in SI units) of It says that the electromagnetic force on a charge q is a combination of a force in the direction of the electric field E proportional to the magnitude of the field and the quantity of charge, and a force at right angles to the magnetic field B and the velocity v of the charge, proportional to the magnitude of the field, the charge, and the velocity.

Related lectures (47)

Magnetostatics: Drude Model and B-Field Circuits

Explores the Drude model, magnetostatics, B-field circuits, force on current elements, material conductivity, torque, and applications of B-fields.

Second Maxwell's equation: Magnetic dipole

Covers Maxwell's equations, magnetic dipoles, vector potential, torque, and field patterns.

Magnetism: Basics and Phenomena

Explores the basics of magnetism, magnetic fields, and magnetic properties in materials.

Magnetic Forces: Biot-Savart Law

Explores magnetic phenomena, current, charge conservation, Biot-Savart law, and Ampère's force law.

Magnetic Fields and Maxwell's Equations