磁偶极矩 - 百度百科
磁偶极矩（magnetic dipole moment）是用来表征 磁偶极子 产生磁场的能力的物理量，记为Pm，是一个矢量，方向可依电流绕行方向按 右手螺旋定则 确定。 [1] 在静电学中，将一个大小相等、符号相反的束缚在一起的电荷系统称为 电偶极子，为标志它产生电场的能力，引入了 电偶极矩。 具有强度相等极性相反的两磁极的磁铁、与之等效的圆电流或载流线圈的磁场分布很像电偶极子的电场分布，故称为磁偶极子。 为了表征磁偶极子产生磁场的能力，引入磁偶极矩，它也 …
5.4: Magnetic Dipole Moment and Magnetic Dipole Media
Magnetic dipole and its potential. A(r) = μ0 4πm × r r3, where the vector m, defined as 40. m ≡ 1 2∫Vr × j(r)d3r, is called the magnetic dipole moment of the system – that itself, within the long-rang approximation (90), is called the magnetic dipole.
4.2: Magnetic Moment and Torque - Physics LibreTexts
To find the torque vector, we first need the magnetic moment. We calculate that to be (use RHR for direction): Although we derived the formula for the magnetic dipole moment using a rectangle, it turns out that as long as the loop lies in a plane, the formula works no matter what shape it is.
Magnetic Dipole Moment - GeeksforGeeks
2023年6月2日 · A magnetic dipole moment is also referred to as a magnetic moment of dipole and it is made up of two magnetic north poles separated by a short distance. The magnetic dipole moment is calculated as the product of the current and the area of the current carrying loop.
Magnetic Dipole - Physics Book - gatech.edu
2024年11月20日 · The magnetic dipole moment represents the magnitude of the field of the dipole, essentially its magnetic potential. The most common unit for the dipole moment is Ampere-square meters which is derived from how you calculate the moment of a coil of wire.
Magnetic dipoles & dipole moment (video) | Khan Academy
A tiny current loop act's as a tiny magnet technically called a magnetic dipole. The strength of that tiny magnet, the magnetic dipole moment m, is given by m = NIA, giving the units - Ampere meter square. The magnetic dipole moment is a vector quantity and its direction is given by the right-hand thumb rule.
17.1: Introduction to Magnetic Dipole Moments
This chapter explores some of these aspects of magnetic moment. In previous chapters, I have used the symbols \(p_e\) and \(p_m\) for electric and magnetic dipole moment. In this chapter I shall be concerned exclusively with magnetic moment, and so I …
2016年8月19日 · The magnetic dipole moment of a substance (how well it acts as a magnet) can be determined by suspending a sample of the substance on a torsion fiber and measuring the period of the oscillations of the sample in an applied magnetic field.
Magnetic Dipole Moment - Definition, Equation And Formula
Magnetic dipole moments have dimensions of current times area or energy divided by magnetic flux density. The unit for dipole moment in metre–kilogram– second–ampere is ampere-square metre. The unit in centimetre–gram–second unit system, is the erg (unit of energy) per gauss (unit of magnetic flux density).
Magnetic Dipole Moment - HyperPhysics
The torque on a current-carrying coil, as in a DC motor, can be related to the characteristics of the coil by the "magnetic moment" or "magnetic dipole moment". The torque exerted by the magnetic force (including both sides of the coil) is given by