Question
Sat July 14, 2012 By: Arathi M

Why do the electrons move towards the point C under the magnetic field in the experiment about the charge to mass ratio of electrons?

Expert Reply
Wed July 25, 2012

The Lorentz force law(from Physics) tells us that a charged particle experiences a force in an area where there exists an electric or magnetic field and it is evident from Maxwell's theory also that charged particles(electromagnetic particles) could be deflected in a magnetic field. So, on applying a magnetic field, these electrons will be deflected by magnetic field. In this setup, the electron will move perpendicular to the magnetic field. Thus, the force on the electron is:

F= evH

Hence, if greater is the magnitude of negative charge, greater is the interaction with magnetic field and greater is the deflection towards C. 

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