An electron enters the space between the plates of a charged capacitor as shown. The charge density on the plate is 
. Alectric intensity in the space between the plates is E. A uniform magnetic field 
also exists in that space perpendicular to the direction of 
. The electron moves perpendicular to both 
and 
without any change in direction. The time taken by the electron to travel a distance 
in that space is
Text Solution
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: Force on the electron due to the electric field 
is
force on the electron due to the magnetic field 
is
The electron will move in the fields undeflected, if these two forces are equal and opposite
Electric field between the plates is 
The time taken by the electron to travel a distance 
in the space is
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