Physics :(( help please TT
posted by OIan .
A source of ions at point O produces a slightly diverging beam with halfangle of divergence α0≪1. In order to collimate (refocus) the beam, one can apply a uniform magnetic field along the zaxis (see the figure below). If all the ions have the same initial velocity and specific charge qm, the beam focuses at point A, again at point B and so on. Assuming that qm=10^5C/kg , B=10^−3T and v=100m/s find the distance
OA¯¯¯¯¯ in meters

1.5 meters

A source of ions at point O produces a slightly diverging beam with halfangle of divergence α0≪1. In order to collimate (refocus) the beam, one can apply a uniform magnetic field along the zaxis (see the figure below). If all the ions have the same initial velocity and specific charge qm, the beam focuses at point A, again at point B and so on. Assuming that qm=105C/kg , B=10−3T and v=100m/s find the distance OA¯¯¯¯¯ in meters.

answer \?????????

1.2

pretty sure it is 5.6 meters

5.6 is wrong

is 1.2 correct

@tttt Mind your language. His answer might have been wrong but he has been trying to help you nonetheless. :)

solution?

please don't copy all answers for them....
Please.. Avoid cheating a wrong answer.
Post a correct answer.. You fool! 
Try 6.283

6.283 is correct

how you do that