If an electron enters with a velocity 
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 
plane then the configuration of electric field and magnetic field is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
The orbit of the electron spirals down inside the cube in a plane parallel to 
plane. therefore 
must be along 
direction and 
should be along 
-axis
i.e. 
and 
where 
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