Radius of helical motion in a magetic field

1. The problem statement, all variables and given/known data
When the charge enters the magnetic feld at an angle x , how the radius can be expressed as?

2. Relevant equations
Force of charge in a magentic field = qvbsinx
centripetal force = mv^2/r

3. The attempt at a solution
when i combined the two equations above, i got r=mv/qbsinx,
but the question i did said the radius is directly proportional to sinx. What i have done wrong?Hope someone can help me 🙂


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