A particle of charge q and mass 
starts moving from the origin under the action of an electric 
and 
with a velocity 
. The speed of the particle will become 
after a time
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
is parallel to 
and 
is perpendicular to both. Therefore, path of the particle is at helix with increasing pitch. Speed of particle at any time t is
Here 
And 
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