A positively charged particle of mass 
is passed through a velocity selector. It moves horizontally rightward without deviation along the line 
with a speed 
. The electric field is vertically downward and magnetic field is into the plane of the paper. Now, the electric field is switched off at 
. The angular momentum of the charged particle about the origin 
at 
is
Text Solution
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Consider motion of the charged particle as shown in the given diagram.
Electric field force and magnetic field force are equal in magnitude and thus it is moving along straight line.
(i)
Now, when electric field is switched off, the particle will move upward and in a circle.
At, 
The particle will be at 
.
Angular momentum
… ..(ii)
From (i) and (ii) 
or 
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