# 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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