An electron beam passes undeflected through a magnetic field of 
weber 
and an electric field of 
both acting simultaneously. If the electric field is removed, what will be the radius of the electron path?
Text Solution
Verified by ExpertsThe correct answer is:
A
If electron beam passes undeflected in simultaneous electric and magnetic fields 
and 
, velocity of beam 
must be mutually perpendicular and the required speed 
is given by
If electric field is removed, the electron traverses a circular path of radius 
given by
Here 
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