Magnetic Force from the Lorentz Force Law 从洛仑兹力到磁力

The magnetic field B is defined from the Lorentz Force Law, and specifically from the magnetic force on a moving charge.The implications of this expression include:1. The force is perpendicular to both the velocity v of the charge q and the magnetic field B.2. The magnitude of the force is F = qvB sinθ where θ is the angle smaller than 180 degrees between the velocity and the magnetic field. This implies that the magnetic force on a stationary charge or a charge moving parallel to the magnetic field is zero.3. The direction of the force is given by the right hand rule. The force relationship above is in the form of a vector product.From the force relationship above it can be deduced that the units of magnetic field are Newton seconds /(Coulomb meter) or Newtons per Ampere meter. This unit is named the Tesla. It is a large unit, and the smaller unit Gauss is used for small fields like the Earth's magnetic field. A Tesla is 10,000 Gauss. The Earth's magnetic field is on the order of half a Gauss.Courtesy: http://hyperphysics.phy-astr.g...

Channel: Education
Uploaded: November 30, 1999 at 12:00 am
Author: applesilk

Length: 00:14
Rating: 4.20
Views: 5494

Tags: Force  Lorentz  Magnetic  Physics  Science  洛仑兹力  物理  磁力  科学  

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