A charged particle (q, m) is released from origin with velocity
in a uniform magnetic field 
(i) Pitch of the helical path described by the particle is–
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Ans.
(i)
Sol. In the figure

V || = v 0 cos 60° = 
V ⊥ = v 0 sin 60° = 
p = v || × T = 
= 
(ii)
Sol. V z = V ⊥ or
after t = 
and v z = –v ⊥ or
after t = 
(iii)
Sol. Z max = 2r =
= 
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