An electron is sent into an airless space at a speed of 
and it must travel along the path shown by the continuous line in the figure below:
The radius 
of the large curve is 
and the radius 
of the small curve is 
. There are two magnetic fields in space that are independent of each other and follow each other.
What should be the magnitudes and directions of the magnetic fields 
and 
for the electron to travel in the desired path?
What should be the magnitudes and directions of the magnetic fields if we use a proton instead of an electron?
What should be the magnitudes and directions of the magnetic fields if we use a neutron instead of an electron?
What if we use the cation 
?
The mass of the electron is 
, the mass of a proton and neutron is 
, and the mass of the cation is 
.
, direction of 
, direction of 
, direction of 
