:TOTALLY WRONG CONCEPT @bout LORENTZ FORCE in Nepali Books.... ACTUALLY Lorentz force IS the force exerted on a charged particle q moving with velocity v through an electric E and magnetic field B . The entire electromagnetic force F on the charged particle is called the Lorentz force (after the Dutch physicist Hendrik A. Lorentz ) and is given by F = qE + qv × B The first term is contributed by the electric field . The second term is the magnetic force and has a direction perpendicular to both the velocity and the magnetic field . The magnetic force is proportional to q and to the magnitude of the vector cross product v × B . In terms of the angle ϕ between v and B , the magnitude of the force equals qvB sin ϕ. An interesting result of the Lorentz force is the motion of a charged particle in a uniform magnetic field. If v is perpendicular to B (i.e., with the angle ϕ between v and B of 90°), the particle will follow a circular trajectory with a radius of r = mv / qB . If the angle ϕ is less than 90°, the particle orbit will be a helix with an axis parallel to the field lines. If ϕ is zero, there will be no magnetic force on the particle, which will continue to move undeflected along the field lines.
Posted on: Sun, 09 Jun 2013 13:42:40 +0000
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