Lorentz force facts for kids
Lorentz's law is a law discovered by the Dutch physicist Hendrik Antoon Lorentz. Lorentz's law defines force that acts on moving charged particles in an electromagnetic field. Force consists of magnetic force and electric force.
F = qE (electric force)
If the charge is positive, the direction of the electric force is equal to direction of electric field.
F = qv*B (magnetic force)
The direction of the magnetic force is given by the right hand rule.
If charged particles move with velocity v in an electric field E and a magnetic field B
F = qE + qv*B
F : force (vector)
q : charge (scalar)
E : electric field (vector)
v : velocity of particle (vector)
B : magnetic field (vector)
* is vector cross product.
Using this law, J.J. Thomson measured masstocharge ratio.
Images for kids

Lorentz' theory of electrons. Formulas for the Lorentz force (I, ponderomotive force) and the Maxwell equations for the divergence of the electrical field E (II) and the magnetic field B (III), La théorie electromagnétique de Maxwell et son application aux corps mouvants, 1892, p. 451. V is the velocity of light.
See also
In Spanish: Fuerza de Lorentz para niños
Bessie Coleman 
Spann Watson 
Jill E. Brown 
Sherman W. White 