into a cubical region
(faces parallel to coordinate planes) in which there are uniform electric and
magnetic fields. The orbit of the electron is found to spiral down inside the
cube in plane parallel to the x-y plane. Suggest a configuration of fields 
and 
that can lead to it.
Answer:
As per question, the
orbit of electron is spiral down inside the cube in a plane parallel to the x-y
plane, therefore, 
must be along +z
direction, i.e., = 
. Here the electric field
should be along x-axis, i.e., 
, where 
.
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