magnetic force question

[osustudent2010]

Hi, I am having trouble with my last physics hw question (below):

When a charged particle moves at an angle of 16° with respect to a magnetic field, it experiences a magnetic force of magnitude F. At what angle (less than 90°) with respect to this field will this particle, moving at the same speed, experience a magnetic force of magnitude 1.5F?

I'm not sure how to solve it. I've tried using F(mag)= qvB (paralell)

But this doesn't work! Any help would be appricated (ASAP)!

[whozum]

You know that F = qv (cross) B, or qvBsin(theta).

qvBsin(16) is F1

1.5F1 = F2
1.5F1 = 1.5qvBsin(16)

F2 = qvBsin(theta)


So basically you want to solve 1.5qvBsin(16) = qvBsin(theta)

The problem states that q,v, and B are constant.