PolymerHard
Question
When a proton is released from rest in a room, it starts with an initial acceleration a0 towards west. When it is projected towards north with a speed v0 it moves with an initial acceleration 3a0 towards west. The electric and magnetic fields in the room are:
Options
A.
B.
C.
D.
Solution
Acceleration of charged particle 
Released from rest
(west)
(west)
when it is projected towards north, acceleration due to magnetic force = 2a0
Therefore magnetic field
down.
Released from rest
(west)(west)when it is projected towards north, acceleration due to magnetic force = 2a0
Therefore magnetic field
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