Cathode ray in a magnetic field.

Cathode rays in magneticfield.

A charged particle is fired into a region with controllable a magnetic field.  The magnetic field points into or out of the view depending on the sign of Bz. 

Enter the Bz value

Bz=

and press the play button to change the field. Observe the force vector on the particle.  The value of Bz is constrained to -0.5 < Bz < 0.5

The cathode ray in a magnetic field IBE  is used with permission of Dr. Juergen Kirstein  (TU Berlin) and  the Deutsches Museum (Munich).