Question

Observing the electron beam from the front of a hemholtz coil, which way does it curve under the influence of the magnetic field (clockwise or counterclockwise)? Based on this, in which direction must the magnetic field produced by the coils be pointing?

Answer 1

- current flow direction is opposite to the direction of electron flow

- Fleming's left hand rule gives the force experienced by a current carrying system in a magnetic field

If magnetic field is into the coils and current flows from left to right the deflection will be in clokwise direction

if the magnetic field is reversed the deflection wll be anticlockwise.

the force experienced by the electrons can be quantitatively given by Lorentz forces

F = qE + qv × B where q is the charge, v is the velocity , E is the electric field , B is the magnetic field

and qvXB is the cross product