what happen if a charged particle projected in a gravity-free room deflects?

When a charged particle is projected in a gravity free space with some velocity v, it depends on whether it experiences electric or magnetic force according to which it will deflect. If there is no magnetic or electric field present, then the charge particle shall continue moving with the same velocity in the same direction.

2) If a charged particle moves un-accelerated in space, there can be various cases due to which this is so:

• There is no electric or magnetic force on the charge i.e. E=0 and B=0 (Either both are zero)
• Or if, both are non zero but the velocity of the charge is such that the electric force on charge is same as magnetic force.

F = qE = qvB

or

If any one of the two is non zero, the charged particle will get deflected.