if an electron enters with a velocity V=Vo j into a cubical region in a uniform electromagnetic field and the orbit of the electron is found to spiral down inside the cube in plane parallel to the xy plane, then the configuration of the electric field and magnetic field is
answer is option b, i can't understand it , anyone please explain using cross product..
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Explanation:
The orbit of the electron spirals down inside the cube in the plane parallel to x−y plane. Therefore
B
→
must be along +z direction and E should be along x−axis.
i.e.
B
→
=B
o
k
^
and
E
→
=E
o
i
^
where E
o
>0
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